Method and apparatus for transmitting control and data information in wireless cellular communication system

ABSTRACT

The present disclosure relates to a communication technique for joining an IoT technology with a 5G communication system for supporting a higher data transfer rate than a 4G system, and a system thereof. The disclosure may be applied to intelligent services (for example, a smart home, a smart building, a smart city, a smart car or a connected car, a health care, a digital education, retailing, security and safe-related service, etc.) on the basis of a 5G communication technology and an IoT related technology. The present disclosure relates to a wireless communication system, and to a method and an apparatus for smoothly providing a service in a communication system. More particularly, the present disclosure relates to a method and an apparatus for transmitting and receiving downlink and uplink control information within a communication system.

TECHNICAL FIELD

The disclosure relates to a wireless communication system and to amethod and a device for efficiently providing a service in acommunication system. More particularly, the disclosure relates to amethod and a device for transmitting/receiving downlink and uplinkcontrol information in a communication system.

BACKGROUND ART

In order to meet wireless data traffic demands, which have increasedsince the commercialization of a 4G communication system, efforts todevelop an improved 5G communication system or a pre-5G communicationsystem have been made. For this reason, the 5G communication system orthe pre-5G communication system is called a beyond-4G-networkcommunication system or a post-LTE system.

In order to achieve a high data transmission rate, implementation of the5G communication system in an mmWave band (for example, a 60 GHz band)is being considered. In the 5G communication system, technologiesregarding beamforming, massive MIMO, full-dimensional MIMO (FD-MIMO),array antennas, analog beamforming, and large-scale antennas are beingdiscussed in order to mitigate a propagation path loss in the mm Waveband and to increase a propagation transmission distance.

Further, in the 5G communication system, technologies such as an evolvedsmall cell, an advanced small cell, a cloud radio access network (cloudRAN), an ultra-dense network, device-to-device communication (D2D), awireless backhaul, a moving network, cooperative communication,coordinated multi-points (CoMP), and received interference cancellationhave been developed in order to improve the system network.

In addition, in the 5G system, advanced coding modulation (ACM) schemessuch as hybrid FSK and QAM modulation (FQAM) and sliding windowsuperposition coding (SWSC), and advanced access technologies such asfilter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA),and sparse code multiple access (SCMA), have been developed.

Meanwhile, the Internet has evolved from a human-oriented connectionnetwork, in which humans generate and consume information, to encompassan Internet-of-Things (IoT) network, in which distributed componentssuch as objects exchange and process information. Internet-of-Everything(IoE) technology, in which big-data processing technology is combinedwith the IoT technology through a connection with a cloud server or thelike, has emerged. In order to implement IoT, technical factors such assensing technology, wired/wireless communication, networkinfrastructure, service-interface technology, and security technologyare required, and research into technologies such as a sensor network,machine-to-machine (M2M) communication, machine-type communication(MTC), and the like for connection between objects has recently beenconducted. In an IoT environment, through collection and analysis ofdata generated by connected objects, an intelligent Internet technology(IT) service that creates new value in peoples' lives may be provided.The IoT may be applied to fields such as those of a smart home, a smartbuilding, a smart city, a smart car or a connected car, a smart grid,health care, a smart home appliance, or high-tech medical servicesthrough the convergence of conventional information technology (IT) andvarious industries.

Accordingly, various attempts to apply the 5G communication to the IoTnetwork are made. For example, technologies (5G communicationtechnologies) such as a sensor network, machine-to-machine (M2M)communication, and machine-type communication (MTC) are implemented bytechniques such as beamforming, MIMO, and array antennas. Theapplication of a cloud RAN as the big data processing technologydescribed above may be an example of convergence of the 5G technologyand the IoT technology.

There is a need for a method and a device using the same, whereinmultiple services can be provided to a user in a communication system asdescribed above, and respective services can be provided within the sametime interval according to the characteristics thereof in order toprovide the multiple services to the user.

DISCLOSURE OF INVENTION Technical Problem

The disclosure provides a method and a device wherein, when a terminalis to transmit uplink control information and uplink data through oneuplink transmission slot or through one or more uplink transmissionslots, the position of the slot through which the uplink controlinformation is transmitted, the control information, and datainformation are transmitted/received efficiently such that communicationbetween the base station and the terminal or between the terminal andanother terminal can be provided efficiently.

In addition, the disclosure provides a method and a device forindicating the start symbol and end symbol (or sections) ofuplink/downlink data to a terminal using a terminal-common controlchannel or a terminal-specific control channel.

In addition, the disclosure provides a method and a device forsimultaneously providing different types of (or identical types of)services, wherein, when a specific type of service influences(interferes with, in a wireless communication environment) another typeof service or the same type of service, the corresponding information isconfigured as control information and is transferred from the basestation to the terminal.

Solution to Problem

In order to solve the above-mentioned problems, a method of a terminalaccording to an embodiment includes: receiving information indicating atleast one time interval, in which scheduling information is to bemonitored, from a base station through a downlink control channel; andreceiving downlink scheduling information or uplink schedulinginformation in the at least one time interval indicated by theinformation.

In order to solve the above-mentioned problems, a terminal according toan embodiment includes: a transmission/reception unit configured totransmit and receive a signal; and a control unit configured to receiveinformation indicating at least one time interval, in which schedulinginformation is to be monitored, from a base station through a downlinkcontrol channel, and configured to receive downlink schedulinginformation or uplink scheduling information in the at least one timeinterval indicated by the information.

In order to solve the above-mentioned problems, a method of a basestation according to an embodiment includes: transmitting informationindicating at least one time interval, in which scheduling informationis to be monitored, to a terminal through a downlink control channel;and transmitting, to the terminal, at least one of downlink schedulinginformation or uplink scheduling information in the at least one timeinterval indicated by the information.

In order to solve the above-mentioned problems, a base station accordingto an embodiment includes: a transmission/reception unit configured totransmit and receive a signal; and a control unit configured to transmitinformation indicating at least one time interval, in which schedulinginformation is to be monitored, to a terminal through a downlink controlchannel, and configured to transmit, to the terminal, at least one ofdownlink scheduling information or uplink scheduling information in theat least one time interval indicated by the information.

In order to solve the above-mentioned problems, a method of a terminalaccording to an embodiment includes: receiving control information forscheduling transmission or reception in a slot from a base stationthrough a control channel; identifying a first symbol indicated by thecontrol information and a second symbol determined based on the formatof the slot; and transmitting/receiving data to/from the base stationaccording to the control information within an interval determined bythe first symbol and the second symbol.

In order to solve the above-mentioned problems, a terminal according toan embodiment includes: a transmission/reception unit configured totransmit and receive a signal; and a control unit configured to receivecontrol information for scheduling transmission or reception in a slotfrom a base station through a control channel, configured to identify afirst symbol indicated by the control information and a second symboldetermined based on the format of the slot, and configured totransmit/receive data to/from the base station according to the controlinformation within an interval determined by the first symbol and thesecond symbol.

In order to solve the above-mentioned problems, a method of a basestation according to an embodiment includes: transmitting controlinformation for scheduling transmission or reception in a slot to aterminal through a control channel; and transmitting/receiving datato/from the terminal according to the control information within aninterval determined by a first symbol indicated by the controlinformation and by a second symbol determined based on the format of theslot.

In order to solve the above-mentioned problems, a base station accordingto an embodiment includes: a transmission/reception unit configured totransmit and receive a signal; and a control unit configured to transmitcontrol information for scheduling transmission or reception in a slotto a terminal through a control channel, and configured totransmit/receive data to/from the terminal according to the controlinformation within an interval determined by a first symbol indicated bythe control information and by a second symbol determined based on theformat of the slot.

In order to solve the above-mentioned problems, a method of a terminalaccording to an embodiment includes: receiving, from a base station, anindicator indicating whether or not a retransmitted code block is to becombined and processed; and decoding, based on the indicator, theretransmitted code block.

In order to solve the above-mentioned problems, a terminal according toan embodiment includes: a transmission/reception unit configured totransmit and receive a signal; and a control unit configured to receive,from a base station, an indicator indicating whether or not aretransmitted code block is to be combined and processed, and configuredto decode, based on the indicator, the retransmitted code block.

In order to solve the above-mentioned problems, a method of a basestation according to an embodiment includes: transmitting, to aterminal, an indicator indicating whether or not a retransmitted codeblock is to be combined and processed; and receiving, from the terminal,a result of decoding the retransmitted code block based on theindicator. In order to solve the above-mentioned problems, a basestation according to an embodiment includes: a transmission/receptionunit configured to transmit and receive a signal; and a control unitconfigured to transmit, to a terminal, an indicator indicating whetheror not a retransmitted code block is to be combined and processed, andconfigured to receive, from the terminal, a result of decoding theretransmitted code block based on the indicator.

Advantageous Effects of Invention

An embodiment of the disclosure provides a method wherein, when aterminal is to transmit uplink control information and uplink datathrough one uplink transmission slot or through more than one uplinktransmission slots, the uplink control information and data aretransmitted/received efficiently such that at least one offrequency-time and space resources and transmission power can be usedefficiently.

In addition, an embodiment of the disclosure minimizes bits added to aterminal-common control channel for indicating common information tomultiple terminals and bits added to a terminal-specific control channelfor scheduling uplink/downlink data to the terminals such that the startsymbol and end symbol (or intervals) of the uplink/downlink data can beindicated to the terminals, and the terminals can transmit/receive theuplink/downlink data through the information.

In addition, an embodiment of the disclosure provides a method whereindata can be transmitted effectively using different types of services ina communication system, data transmission can coexist between thedifferent types of services, thereby satisfying requirements accordingto respective services, and the delay of transmission time can bereduced, or at least one of frequency-time and space resources can beused efficiently.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1A illustrates the basic structure of a time-frequency domain,which is a radio resource domain where data or a control channel istransmitted in a downlink in an LTE system or a system similar thereto.

FIG. 1B illustrates an example of multiplexing services considered in 5Ginto one system and transmitting the same.

FIG. 1C and FIG. 1D illustrate embodiments of a communication system towhich the disclosure is applied.

FIG. 1E illustrates a situation to be resolved by the disclosure.

FIG. 1F illustrates a scheduling method according to an embodiment ofthe disclosure.

FIG. 1G illustrates a scheduling method according to an embodiment ofthe disclosure.

FIG. 1H illustrates the case in which scheduling information isconfigured to receive a signal regarding one or more slots or TTIsaccording to an embodiment of the disclosure.

FIG. 1I illustrates scheduling information that a base station canconfigure for a terminal according to an embodiment of the disclosure.

FIG. 2A illustrates the basic structure of a time-frequency domain in anLTE system.

FIG. 2B illustrates an example of multiplexing and transmitting 5Gservices in one system.

FIG. 2C illustrates the (2-1) embodiment of a communication system towhich the disclosure is applied.

FIG. 2D illustrates the (2-1)^(th) embodiment in the disclosure.

FIG. 2E illustrates a base station procedure and a terminal procedureregarding the (2-1)^(th) embodiment in the disclosure.

FIG. 2F illustrates the (2-2)^(th) embodiment in the disclosure.

FIG. 2G illustrates a base station procedure and a terminal procedureregarding the (2-2)^(th) embodiment in the disclosure.

FIG. 2H illustrates a base station device according to the disclosure.

FIG. 2I illustrates a terminal device according to the disclosure.

FIG. 3A illustrates a downlink time-frequency domain transmissionstructure of an LTE or LTE-A system.

FIG. 3B illustrates an uplink time-frequency domain transmissionstructure of an LTE or LTE-A system.

FIG. 3C illustrates allocation of pieces of data for eMBB, URLLC, andmMTC in connection with a frequency-time resource in a communicationsystem.

FIG. 3D illustrates allocation of pieces of data for eMBB, URLLC, andmMTC in connection with a frequency-time resource in a communicationsystem.

FIG. 3E illustrates control and data information transfer.

FIG. 3F is a block diagram of a method for receiving data by a terminalaccording to the (3-1)^(th) embodiment.

FIG. 3G is a block diagram of a method for receiving data by a terminalaccording to the (3-2)^(th) embodiment.

FIG. 3H illustrates a process of receiving data by a terminal accordingto the (3-3)^(th) embodiment.

FIG. 31A and FIG. 31B are block diagrams of a process for receiving databy a terminal according to the (3-3)^(th) embodiment.

FIG. 3J illustrates a process of receiving data by a terminal accordingto the (3-4)^(th) embodiment.

FIG. 3KA and FIG. 3KB are block diagrams of a process for receiving databy a terminal according to the (3-4)^(th) embodiment.

FIG. 3L is a block diagram illustrating the structure of a terminalaccording to embodiments.

FIG. 3M is a block diagram illustrating the structure of a base stationaccording to embodiments.

MODE FOR THE INVENTION

In describing embodiments of the disclosure, descriptions of technicalcontents that are well-known in the art and are not associated directlywith the disclosure will be omitted. Such an omission of unnecessarydescriptions is intended to prevent obscuring of the main idea of thedisclosure and more clearly transfer the main idea.

For the same reason, in the accompanying drawings, some elements may beexaggerated, omitted, or schematically illustrated. Further, the size ofeach element does not entirely reflect the actual size. In the drawings,identical or corresponding elements are provided with identicalreference numerals.

The advantages and features of the disclosure and ways to achieve themwill be apparent by making reference to embodiments as described belowin detail in conjunction with the accompanying drawings. However, thedisclosure is not limited to the embodiments set forth below, but may beimplemented in various different forms. The following embodiments areprovided only to completely disclose the disclosure and inform thoseskilled in the art of the scope of the disclosure, and the disclosure isdefined only by the scope of the appended claims. Throughout thespecification, the same or like reference numerals designate the same orlike elements.

Here, it will be understood that each block of the flowchartillustrations, and combinations of blocks in the flowchartillustrations, can be implemented by computer program instructions.These computer program instructions can be provided to a processor of ageneral purpose computer, special purpose computer, or otherprogrammable data processing apparatus to produce a machine, such thatthe instructions, which execute via the processor of the computer orother programmable data processing apparatus, create means forimplementing the functions specified in the flowchart block or blocks.These computer program instructions may also be stored in a computerusable or computer-readable memory that can direct a computer or otherprogrammable data processing apparatus to function in a particularmanner, such that the instructions stored in the computer usable orcomputer-readable memory produce an article of manufacture includinginstruction means that implement the function specified in the flowchartblock or blocks. The computer program instructions may also be loadedonto a computer or other programmable data processing apparatus to causea series of operational steps to be performed on the computer or otherprogrammable apparatus to produce a computer implemented process suchthat the instructions that execute on the computer or other programmableapparatus provide steps for implementing the functions specified in theflowchart block or blocks.

And each block of the flowchart illustrations may represent a module,segment, or portion of code, which includes one or more executableinstructions for implementing the specified logical function(s). Itshould also be noted that in some alternative implementations, thefunctions noted in the blocks may occur out of the order. For example,two blocks shown in succession may in fact be executed substantiallyconcurrently or the blocks may sometimes be executed in the reverseorder, depending upon the functionality involved.

As used herein, the “unit” refers to a software element or a hardwareelement, such as a Field Programmable Gate Array (FPGA) or anApplication Specific Integrated Circuit (ASIC), which performs apredetermined function. However, the “unit” does not always have ameaning limited to software or hardware. The “unit” may be constructedeither to be stored in an addressable storage medium or to execute oneor more processors. Therefore, the “unit” includes, for example,software elements, object-oriented software elements, class elements ortask elements, processes, functions, properties, procedures,sub-routines, segments of a program code, drivers, firmware,micro-codes, circuits, data, database, data structures, tables, arrays,and parameters. The elements and functions provided by the “unit” may beeither combined into a smaller number of elements, “unit”, or “module”or divided into a larger number of elements, “unit”, or “module”.Moreover, the elements and “units” may be implemented to reproduce oneor more CPUs within a device or a security multimedia card. Further, inthe embodiments, the “unit” may include at least one processor.

First Embodiment

A wireless communication system has developed beyond the voice-basedservice provided at the initial stage into a broadband wirelesscommunication system that provides high-speed and high-quality packetdata services according to communications standards such as, forexample, high-speed packet access (HSPA) of 3GPP, long-term evolution(LTE) or evolved universal terrestrial radio access (E-UTRA),LTE-advanced (LTE-A), high-rate packet data (HRPD) of 3GPP2,ultra-mobile broadband (UMB), 802.16e of IEEE, and the like. Also, acommunication standard of 5G or new radio (NR) is being developed as a5G wireless communication system.

In such a wireless communication system, including 5G, a terminal may beprovided with at least one service among enhanced mobile broadband(eMBB), massive machine-type communications (mMTC), and ultra-reliableand low-latency communications (URLLC). Such services may be provided tothe same terminal during the same time interval. In all embodiments ofthe disclosure described below, the eMBB may be a service aimed athigh-speed transmission of large-capacity data, the mMTC may be aservice aimed at minimizing terminal power and connecting multipleterminals, and the URLLC may be a service aimed at high reliability andlow latency, but the disclosure is not limited thereto. It may also beassumed in all embodiments of the disclosure described below that theURLLC service transmission time is shorter than the eMBB servicetransmission time and the mMTC service transmission time, but thedisclosure is not limited thereto. The above three services may be majorscenarios in a system such as an LTE system or a post-LTE 5G/NR(new-radio or next-radio) system.

Hereinafter, embodiments of the disclosure will be described in detailwith reference to the accompanying drawings. In the followingdescription of the disclosure, a detailed description of known functionsor configurations incorporated herein will be omitted when it may makethe subject matter of the disclosure rather unclear. The terms whichwill be described below are terms defined in consideration of thefunctions in the disclosure, and may be different according to users,intentions of operators, or customs. Therefore, the definitions of theterms should be made based on the contents throughout the specification.As used herein, “base station” refers to an entity which configuresinformation for controlling part or all of a terminal, and whichperforms resource allocation, and may be at least one of an eNode B, aNode B, a base station (BS), a wireless access unit, a base stationcontroller, a transmission and reception unit (TRP), or a node on anetwork. A terminal may include user equipment (UE), a mobile station(MS), a cellular phone, a smartphone, a computer, or a multimedia systemcapable of performing a communication function.

In the disclosure, “downlink (DL)” refers to a path of wirelesstransmission of a signal that a base station transmits to a terminal,and “uplink (UL)” refers to a path of wireless communication of a signalthat a terminal transmits to a base station. Although embodiments of thedisclosure will be described hereinafter with reference to an exemplaryLTE or LTE-A system, embodiments of the disclosure are also applicableto other communication systems having similar technical backgrounds orchannel types. For example, the 5^(th)-generation mobile communicationtechnology (5G new radio (NR)) that is developed as post-LTE-A maybelong thereto. In addition, embodiments of the disclosure may beapplied to other communication systems through a partial modificationthat is not deemed by a person skilled in the art to substantiallydeviate from the scope of the disclosure.

An LTE system, which is a representative example of the broadbandwireless communication system, employs an orthogonal frequency divisionmultiplexing (OFDM) scheme for a downlink (DL), and employs a singlecarrier frequency division multiple access (SC-FDMA) scheme for anuplink (UL). “Uplink” refers to a wireless link through which a terminal(or user equipment (UE) or a mobile station (MS)) transmits data or acontrol signal to a base station (BS) (or eNodeB), and “downlink” refersto a wireless link through which a base station transmits data or acontrol signal to a terminal. In the multiple access schemes describedabove, time-frequency resources for carrying data or control informationare allocated and operated in a manner that prevents overlapping of theresources, i.e. to establish orthogonality between users so as toidentify data or control information of each user.

When decoding fails at the time of initial transmission, the LTE systememploys a hybrid automatic repeat reQuest (HARQ) scheme that retransmitsthe corresponding data in a physical layer. According to the HARQscheme, when the receiver fails to accurately decode data, the receivertransmits information that indicates decoding failure (negativeacknowledgement (NACK)) to the transmitter such that the transmitter canretransmit the corresponding data in the physical layer. The receivercombines data retransmitted by the transmitter with data, the decodingof which has previously failed, thereby improving the data receptionperformance. Also, when the receiver accurately decodes data, thereceiver may transmit information that indicates successful decoding(acknowledgement (ACK)) to the transmitter such that the transmitter cantransmit new data.

FIG. 1A illustrates the basic structure of a time-frequency domain,which is a radio resource domain where data or a control channel istransmitted in a downlink of an LTE system.

In FIG. 1A, the horizontal axis indicates the time domain, and thevertical axis indicates the frequency domain. The smallest transmissionunit in the time domain is an OFDM symbol, N_(symb) OFDM symbols 1 a-102constitute one slot 1 a-106, and two slots constitute one subframe 1a-105. The length of each slot is 0.5 ms, and the length of eachsubframe is 1.0 ms. The radio frame 1 a-114 is a time-domain unitincluding ten subframes. The smallest transmission unit in the frequencydomain is a subcarrier, and the bandwidth of the entire systemtransmission bandwidth includes a total of N_(BW) subcarriers 1 a-104.

In the time-frequency domain, the basic resource unit is a resourceelement (RE) 1 a-112, which may be expressed by an OFDM symbol index anda subcarrier index. A resource block (RB) (or physical resource block(PRB) 1 a-108 is defined by N_(symb) consecutive OFDM symbols 1 a-102 inthe time domain and N_(RB) consecutive subcarriers 1 a-110 in thefrequency domain. Therefore, one RB 1 a-108 includes N_(symb)×N_(RB) REs1 a-112. Generally, the minimum transmission unit of data is the RBunit. In the LTE system, generally, N_(symb)=7 and N_(RB)=12, and N_(BW)and N_(RB) are proportional to the bandwidth of the system transmissionband. The data rate increases in proportion to the number of RBs thatare scheduled for the terminal. An LTE system defines and operates sixtransmission bandwidths. In the case of an FDD system that separatelyoperates the downlink and the uplink on the basis of frequency, thedownlink transmission bandwidth and the uplink transmission bandwidthmay differ from each other. The channel bandwidth denotes an RFbandwidth corresponding to the system transmission bandwidth. Table 1provided below indicates the correlation between a system transmissionbandwidth and a channel bandwidth defined in the LTE system. Forexample, in the case of an LTE system having a channel bandwidth of 10MHz, the transmission bandwidth includes 50 RBs.

TABLE 1 Channel 1.4 3 5 10 15 20 bandwidth BW_(channel) [MHz]Transmission 6 15 25 50 75 100 bandwidth configuration

Downlink control information is transmitted within the initial N OFDMsymbols inside the subframe. In general, N={1,2,3}. Therefore, the valueof N may be changed for each subframe based on the amount of controlinformation to be transmitted in the current subframe. The controlinformation includes a control channel transmission interval indicatorindicating the number of OFDM symbols across which control informationis transmitted, scheduling information associated with downlink data oruplink data, a HARQ ACK/NACK signal, or the like.

In the LTE system, scheduling information associated with downlink dataor uplink data is transmitted from a base station to a terminal viadownlink control information (DCI). “Uplink (UL)” refers to a wirelesslink through which the terminal transmits data or a control signal tothe base station, and “downlink (DL)” refers to a wireless link throughwhich the base station transmits data or a control signal to theterminal. The DCI is defined in various formats such that a DCI formatis applied and employed based on a definition regarding whether the sameindicates scheduling information regarding uplink data (uplink (UL)grant) or scheduling information regarding downlink data (downlink (DL)grant), whether or not the same indicates compact DCI having a smallcontrol information size, whether or not spatial multiplexing usingmultiple antennas is applied, and whether or not the same indicates DCIfor power control. For example, DCI format 1, corresponding toscheduling control information regarding downlink data (DL grant), isconfigured to include at least the following pieces of controlinformation.

-   -   Resource allocation type 0/1 flag: indicates whether the        resource allocation scheme is type 0 or type 1. Type 0 applies a        bitmap scheme and allocates resources in units of resource block        groups (RBGs). In the LTE system, the basic unit of scheduling        is a resource block (RB), expressed by time and frequency domain        resources, and an RBG includes multiple RBs and is used as a        basic unit of scheduling in the type 0 scheme    -   Resource block assignment: indicates RBs assigned to data        transmission. Expressed resources are determined according to        the system bandwidth and the resource allocation scheme.    -   Modulation and coding scheme (MCS): indicates the modulation        scheme used for data transmission and the size of the transport        block, which is the data to be transmitted.    -   HARQ process number: indicates the process number of the HARQ.    -   New data indicator: indicates HARQ initial transmission or        retransmission.    -   Redundancy version: indicates the redundancy version of the        HARQ.    -   Transmit power control (TPC) command for physical uplink control        channel (PUCCH): indicates a transmit power control command        regarding a PUCCH, which is an uplink control channel.

The DCI undergoes channel coding and modulation processes and istransmitted through a physical downlink control channel (PDCCH), whichis a downlink physical control channel, or through an enhanced PDCCH(EPDCCH).

In general, the DCI is channel-coded independently of each terminal, andis then transmitted through each independently configured PDCCH. In thetime domain, the PDCCH is mapped and transmitted during the controlchannel transmission interval. The frequency-domain mapping position ofthe PDCCH is determined by the identifier (ID) of each terminal, and isdistributed across the entire system transmission band.

The downlink data is transmitted through a physical downlink sharedchannel (PDSCH), which is a physical channel dedicated to downlink datatransmission. The PDSCH is transmitted after the control channeltransmission interval, and scheduling information such as the specificmapping position in the frequency domain and the modulation schemeindicates the DCI transmitted through the PDCCH.

By using an MCS including five bits among the control informationconstituting the DCI, the base station notifies the terminal of themodulation scheme applied to the PDSCH to be used for transmission andthe size of the data to be transmitted (transport block size (TBS)). TheTBS corresponds to the size before channel coding for error correctionis applied to the data (transport block (TB)) to be transmitted by thebase station.

The modulation scheme supported by the LTE system includes quadraturephase shift keying (QPSK), 16 quadrature amplitude modulation (QAM), and64QAM, and modulation orders (Q_(m)) thereof correspond to 2, 4, and 6,respectively. That is, in the case of the QPSK modulation, 2 bits can betransmitted per symbol; in the case of the 16QAM modulation, 4 bits canbe transmitted per symbol; and in the case of 64QAM modulation, 6 bitscan be transmitted per symbol.

Compared with LTE Rel-8, 3GPP LTE Rel-10 has adopted a bandwidthextension technology in order to support a larger amount of datatransmission. The technology referred to as “bandwidth extension” or“carrier aggregation (CA)” can increase the amount of data transmissionin proportion to the extended bandwidth, compared with an LTE Rel-8terminal that extends the bandwidth and transmits data in one band. Eachof the bands is referred to as a component carrier (CC), and an LTERel-8 terminal is required to have one CC for each of downlink anduplink transmissions. In addition, the downlink CC and the uplink CC,which is connected thereto by SIB-2, are collectively referred to as acell. The SIB-2 connectivity between the downlink CC and the uplink CCis transmitted as a system signal or an upper-level signal. A terminalsupporting the CA can receive downlink data and can transmit uplink datathrough multiple serving cells.

When a base station has difficulty sending a physical downlink controlchannel (PDCCH) to a specific terminal in a specific cell under Rel-10,the base station may transmit the PDCCH in another serving cell and mayconfigure a carrier indicator field (CIF) as a field informing that thecorresponding PDCCH indicates a physical downlink shared channel (PDSCH)or a physical uplink shared channel (PUSCH) of another serving cell. TheCIF may be configured for a terminal supporting the CA. The CIF has beendetermined such that three bits can be added to PDCCH information in aspecific serving cell so as to indicate another serving cell, the CIF isincluded only when cross-carrier scheduling is performed, and thecross-carrier scheduling is not performed when the CIF is not included.When the CIF is included in downlink assignment information (DLassignment), the CIF indicates a serving cell in which a PDSCH scheduledby the DL assignment is to be transmitted; and when the CIF is includedin uplink resource assignment information (UL grant), the CIF is definedso as to indicate the serving cell in which a PUSCH scheduled by the ULgrant is to be transmitted.

As described above, carrier aggregation (CA) is defined as a bandwidthextension technology in LTE-10 such that multiple serving cells can beconfigured for a terminal. The terminal transmits channel informationregarding the multiple serving cells to the base station periodically oraperiodically for the purpose of data scheduling of the base station.The base station schedules data for each carrier and transmits the same,and the terminal transmits A/N feedback regarding data transmitted withregard to each carrier. LTE Rel-10 is designed such that a maximum of 21bits of A/N feedback is transmitted, and when A/N feedback transmissionand channel information transmission overlap in one subframe, the A/Nfeedback is transmitted, and the channel information is discarded. LTERel-11 is designed such that channel information of one cell ismultiplexed together with A/N feedback such that of a maximum of 22 bitsof A/N feedback and channel information of one cell are transmittedthrough PUCCH format 3 by using a transmission resource of PUCCH format3.

LTE-13 assumes a scenario wherein a maximum of 32 serving cells areconfigured, and establishes a concept wherein bands not only in alicensed band but also in an unlicensed band are used to extend thenumber of serving cells to a maximum of 32. In addition, considering thefact that the number of licensed bands is limited, as in the case of theLTE frequencies, providing an LTE service in an unlicensed band such as5 GHz band has been completed, and is referred to as licensed assistedaccess (LAA). The LAA applies carrier aggregation technology in the LTEand supports operating an LTE cell, which is a licensed band, as aprimary cell (PCell) and operating an LAA cell, which is an unlicensedband, as a secondary cell (SCell). Accordingly, feedback occurring inthe LAA cell, which is an SCell, needs to be transmitted only in thePCell as in the case of LTE, and the downlink subframe and the uplinksubframe can be freely applied to the LAA cell. Unless otherwisespecified in the specification, “LTE” as used herein includes alladvanced technologies of LTE, such as LTE-A and LAA.

Meanwhile, the new radio access technology (NR), which is a post-LTEcommunication system, that is, a 5^(th)-generation wireless cellularcommunication system (hereinafter, referred to as 5G) needs to be ableto freely accommodate various requirements of the user, the serviceprovider, and the like, and a service satisfying such variousrequirements can be provided accordingly.

Therefore, 5G may be defined as a technology for satisfying requirementsselected for various 5G-oriented services, among requirements such as amaximum terminal transmission rate of 20 Gbps, a maximum terminal speedof 500 km/h, a maximum latency of 0.5 ms, and a terminal access densityof 1,000,000 terminal/km², in connection with various 5G-orientedservices such as enhanced mobile broadband (hereinafter, referred to aseMBB), massive machine-type communication (hereinafter, referred to asmMTC), ultra-reliable and low-latency communications (hereinafter,referred to as URLLC).

For example, in order to provide eMBB in 5G, one base station needs tobe able to provide a maximum terminal transmission rate of 20 Gbps inthe downlink, and a maximum terminal transmission rate of 10 Gbps in theuplink. At the same time, the average transmission rate that is actuallyexperienced by the terminal needs to be increased. In order to satisfythis requirement, it is necessary to improve the transmission/receptiontechnology, including further improved multiple-input multiple-outputtransmission technology.

At the same time, mMTC is considered for use in supporting anapplication service such as Internet of things (IoT) in 5G. In order toefficiently provide IoT, mMTC is required to meet requirements such assupport for large-scale terminal access in a cell, terminal coverageimprovement, improved battery time, and terminal cost reduction. A largenumber of terminals (for example, 1,000,000 terminals/km′) needs to besupported in a cell such that the same are attached to various sensorsand devices to provide communication functions according to the IoT. Inaddition, mMTC is required to have a coverage larger than that providedby eMBB because, due to the service characteristics thereof, terminalsare likely to be positioned in coverage holes, such as a basement of abuilding, where cell coverage fails. Since mMTC is likely to beconfigured by inexpensive terminals, and since it is difficult tofrequently replace the batteries of the terminals, a very long batterylifetime is required.

Lastly, in the case of URLLC, it is required to provide cellular-basedwireless communication used for a specific purpose, specifically,communication that provides ultra-low latency and ultra-high reliabilityin connection with services used for remote control of a robot ormachinery, industrial automation, unmanned aerial vehicles, remotehealth control, and emergency notifications. For example, URLLC has therequirement that the maximum latency be shorter than 0.5 ms and that apacket error ratio equal to or less than 10⁻⁵ be provided. Accordingly,URLLC has the design requirement that the same provide a transmit timeinterval (TTI) smaller than that of a 5G service such as eMBB and that alarge resource be allocated in the frequency band.

The services considered in the 5^(th)-generation wireless cellularcommunication system described above need to be provided as a singleframework. That is, for the purpose of efficient resource management andcontrol, respective services are preferably integrated into a singlesystem, controlled, and transmitted, instead of being operatedindependently.

FIG. 1B illustrates an example of multiplexing services considered in 5Ginto one system and transmitting the same.

In FIG. 1B, the frequency-time resource 1 b-01 used by 5G may include afrequency axis 1 b-02 and a time axis 1 b-03. FIG. 1B illustrates anexample wherein, inside one framework, 5G operates eMBB 1 b-05, mMTC 1b-06, and URLLC 1 b-07 by means of a 5G base station. It is alsopossible to consider, as a service that can be additionally consideredin 5G, an enhanced mobile broadcast/multicast service (eMBMS) 1 b-08 forproviding a cellular-based broadcasting service. Services considered in5G, such as eMBB 1 b-05, mMTC 1 b-06, URLLC 1 b-07, and eMBMS 1 b-08,may be multiplexed and transmitted by means of time-divisionmultiplexing (TDM) or frequency division multiplexing (FDM) inside onesystem frequency bandwidth operated by 5G, and it is also possible toconsider spatial division multiplexing. In the case of eMBB 1 b-05, itis preferred to occupy and transmit the maximum frequency bandwidth at aspecific arbitrary time in order to provide the above-mentionedincreased data transmission rate. Accordingly, the service of eMBB 1b-05 is preferably subjected to TDM with other services and transmittedwithin the system transmission bandwidth 1 b-01, but the same is alsopreferably subjected to FDM with other services and transmitted withinthe system transmission bandwidth, as required by other services.

In the case of mMTC 1 b-06, an increased transmission interval isrequired to secure a wide coverage unlike other services, and thecoverage can be secured by repeatedly transmitting the same packetinside the transmission interval. At the same time, there is a limit onthe transmission bandwidth that a terminal can receive in order toreduce the complexity and price of the terminal. In view of suchrequirements, the mMTC 1 b-06 is preferably subjected to TDM with otherservices and transmitted within the system transmission bandwidth 1 b-01of 5G.

In order to satisfy the ultra-latency requirement required by services,URLLC 1 b-07 preferably has a short transmit time interval (TTI)compared with other services. At the same time, the same preferably hasa large bandwidth in terms of frequency because a low coding rate isnecessary to satisfy the ultra-latency requirement. In view of suchrequirements of URLLC 1 b-07, URLLC 1 b-07 is preferably subjected toTDM with other services within the transmission system bandwidth 1 b-01of 5G.

Respective services described above may have differenttransmission/reception techniques and transmission/reception parametersin order to satisfy requirements required by respective services. Forexample, respective services may have different numerologies accordingto respective service requirements. As used herein, the numerologyincludes the length of a cyclic prefix (CP), the subcarrier spacing, thelength of an OFDM symbol, and the length of a TTI in a communicationsystem based on orthogonal frequency division multiplexing (OFDM) ororthogonal frequency division multiple access (OFDMA). As an example ofhaving different numerologies between services, eMBMS 1 b-08 may have aCP length longer than that of other services. Since eMBMS 1 b-08transmits broadcast-based upper-level traffic, the same may transmit thesame data in all cells. From the viewpoint of a terminal, if signalsreceived in multiple cells arrive within the CP length, the terminal canreceive and decode all of the signals and thus can obtain singlefrequency network (SFN) diversity gain; accordingly, there is anadvantage in that even a terminal positioned at a cell boundary canreceive broadcast information with no coverage limit. However, when theCP length is longer than that of other services in connection withproviding eMBMS in 5G, the CP overhead generates waste, a longer OFDMsymbol length is accordingly required than that of other services, and anarrower subcarrier spacing is also required than that of otherservices.

As another example of using different numerologies between services in5G, URLLC may require a smaller TTI than that of other services, ashorter OFDM symbol length may be accordingly required, and a largersubcarrier spacing may also be required.

The necessity of various services for satisfying various requirements in5G, and requirements regarding representative services that are beingconsidered, have been described above.

Frequencies in which 5G is considered to operate range from several GHzto tens of GHz; in bands with low frequencies (several GHz), frequencydivision duplex (FDD) is preferred to time division duplex (TDD); and inbands with high frequencies (tens of GHz), TDD is considered moreappropriate than FDD. However, unlike FDD that uses a separate frequencyfor uplink/downlink transmission and seamlessly provides uplink/downlinktransmission resources, TDD needs to support both uplink and downlinktransmissions by a single frequency and, depending on the time, supportsonly uplink resources or downlink resources. Assuming that the TDD needsURLLC uplink transmission or downlink transmission, the latency untilthe time when uplink or downlink resources appear makes it difficult tosatisfy the ultra-latency requirement required by URLLC. Accordingly, inthe case of TDD, there is a need for a method for dynamically changing asubframe uplink or downlink according to whether data of URLLC is uplinkor downlink, in order to satisfy the ultra-latency requirement of URLLC.

Meanwhile, there is such a requirement that, even when services andtechnologies for 5G phase 2 or beyond-5G are multiplexed later at a 5Goperation frequency according to 5G, such services and technologies for5G phase 2 or beyond-5G need to be provided without any issue ofbackward compatibility with operation of previous 5G technologies. Sucha requirement is referred to as forward compatibility, and technologiesfor satisfying forward compatibility need to be considered duringinitial 5G design. Since the forward compatibility has been consideredinsufficiently in the initial LTE standardization stage, there may berestrictions on providing a new service inside the LTE framework. Forexample, in the case of enhanced machine-type communication (eMTC)applied to LTE release-13, communication is possible only at a frequencycorresponding to 1.4 MGz, regardless of the system bandwidth provided bya serving cell, in order to reduce the terminal price by decreasing thecomplexity of the terminal. Accordingly, a terminal supporting eMTCcannot receive a physical downlink control channel (PDCCH) that istransmitted through the entire band of the existing system transmissionbandwidth, thereby incurring a restriction in that signals cannot bereceived in a time interval in which the PDCCH is transmitted.Therefore, a 5G communication system needs to be designed such thatservices considered after the 5G communication system can operate whileefficiently coexisting with the 5G system. For the purpose of forwardcompatibility in a 5G communication system, it is necessary to be ableto freely allocate and transmit resources such that services to beconsidered in the future can be freely transmitted in a time-frequencyresource domain supported by the 5G communication system. Accordingly,there is a need for a method for freely allocating time-frequencyresources such that forward compatibility can be supported in a 5Gcommunication system.

Hereinafter, preferred embodiments of the disclosure will be describedin detail with reference to the accompanying drawings. Here, it is to benoted that identical reference numerals denote the same constituentelements in the accompanying drawings. Further, a detailed descriptionof a known function and configuration which may make the subject matterof the disclosure unclear will be omitted.

Further, although the following detailed description of embodiments ofthe disclosure will be directed to LTE and 5G systems, it can beunderstood by those skilled in the art that the main gist of thedisclosure may also be applied to any other communication systems havingsimilar technical backgrounds and channel types, with a slightmodification, without substantially departing from the scope of thedisclosure.

The following description concerns a 5G communication system wherein 5Gcells operate in a standalone type, or a 5G communication system wherein5G cells are combined with other standalone 5G cells through dualconnectivity or carrier aggregation and operate in a non-standalonetype.

FIG. 1C and FIG. 1D illustrate embodiments of a communication system towhich the disclosure is applied. Schemes proposed in the disclosure areall applicable to the system of FIG. 1C and the system of FIG. 1D.

Referring to FIG. 1C, the upper figure of FIG. 1C (FIG. 1CA) illustratesa case wherein a 5G cell 1 c-02 operates in a standalone type within asingle base station 1 c-01 in a network. The terminal 1 c-04 is a5G-capable terminal having a 5G transmission/reception module. Theterminal 1 c-04 acquires synchronization through a synchronizationsignal transmitted in the 5G standalone cell 1 c-11, receives systeminformation, and then attempts random access to the 5G base station 1c-01. After completing RRC connection with the 5G base station 1 c-01,the terminal 1 c-04 transmits/receives data through the 5G cell 1 c-02.In this case, there is no limit on the duplex type of the 5G cell 1c-02. In the system of the upper figure of FIG. 1C, the 5G cell may havemultiple serving cells.

Next, the lower figure of FIG. 1C (FIG. 1CB) illustrates a case whereina 5G standalone base station 1 c-11 and a 5G non-standalone base station1 c-12 for increasing the amount of data transmission are installed. Theterminal 1 c-14 is a 5G-capable terminal having a 5Gtransmission/reception module for performing 5G communication inmultiple base stations. The terminal 1 c-14 acquires synchronizationthrough a synchronization signal transmitted in the 5G standalone cell 1c-11, receives system information, and then attempts random access tothe 5G standalone base station 1 c-11. After completing RRC connectionwith the 5G standalone base station 1 c-11, the terminal 1 c-14additionally configures a 5G non-standalone cell 1 c-15 andtransmits/receives data through the 5G standalone base station 1 c-11 orthe 5G non-standalone base station 1 c-12. In this case, there is nolimit on the duplex type of the 5G standalone base station 1 c-11 or the5G non-standalone base station 1 c-12, and it is assumed that the 5Gstandalone base station 1 c-11 and the 5G non-standalone base station 1c-12 are connected by an ideal backhaul network or an unideal backhaulnetwork. Accordingly, fast inter-base station X2 communication 1 c-13 ispossible when an ideal backhaul network 1 c-13 is provided. In thesystem shown in the lower figure of FIG. 1C, the 5G cell may havemultiple serving cells.

Next, referring to FIG. 1D, the upper figure of FIG. 1D (FIG. 1DA)illustrates a case wherein an LTE cell 1 d-02 and a 5G cell 1 d-03coexist inside a single base station 1 d-01 in a network. The terminal 1d-04 may be an LTE-capable terminal having an LTE transmission/receptionmodule, a 5G-capable terminal having a 5G transmission/reception module,and a terminal having both an LTE transmission/reception module and a 5Gtransmission/reception module. The terminal 1 d-04 acquiressynchronization through a synchronization signal transmitted in the LTEcell 1 d-02 or the 5G cell 1 d-03, receives system information, and thentransmits/receives data with the base station 1 d-01 through the LTEcell 1 d-02 or the 5G cell 1 d-03. In this case, there is no limit onthe duplex type of the LTE cell 1 d-02 or the 5G cell 1 d-03. Uplinkcontrol transmission is transmitted through the LTE cell 1 d-02 when theLTE cell is the PCell, and through the 5G cell 1 d-03 when the 5G cellis the PCell. In the system of the upper figure of FIG. 1D, the LTE celland the 5G cell may have multiple serving cells and may support a totalof 32 serving cells. It is assumed that the base station 1 d-01 in thenetwork has both an LTE transmission/reception module (system) and a 5Gtransmission/reception module (system), and the base station 1 d-01 cancontrol and operate the LTE system and the 5G system in real time. Forexample, when time resources are divided such that the LTE system andthe 5G system operate at different times, allocation of time resourcesto the LTE system and to the 5G system can be selected dynamically. Byreceiving a signal that indicates allocation of resources (for example,time resources, frequency resources, antenna resources, or spaceresources) that are separately operated by the LTE cell and the 5G cellfrom the LTE cell 1 d-02 or the 5G cell 1 d-03, the terminal 1 d-04 canbe aware of which resources are used to receive data from the LTE cell 1d-02 and the 5G cell 1 d-03.

The lower figure of FIG. 1D (FIG. 1DB) illustrates a case wherein an LTEmacro base station 1 d-11 for a wide coverage and a 5G small basestation 1 d-12 for increasing the amount of data transmission areinstalled in a network. The terminal 1 d-14 may be an LTE-capableterminal having an LTE transmission/reception module, a 5G-capablemodule having a 5G transmission/reception module, and a terminal havingboth an LTE transmission/reception module and a 5Gtransmission/reception module. The terminal 1 d-14 acquiressynchronization through a synchronization signal transmitted from theLTE base station 1 d-11 or the 5G base station 1 d-12, receives systeminformation, and then transmits/receives data through the LTE basestation 1 d-11 and the 5G base station 1 d-12. In this case, there is nolimit on the duplex type of the LTE macro base station 1 d-11 or the 5Gsmall base station 1 d-12. Uplink control transmission is transmittedthrough the LTE cell 1 d-11 when the LTE cell is the PCell, and throughthe 5G cell 1 d-12 when the 5G cell is the PCell. It is assumed that theLTE base station 1 d-11 and the 5G base station 1 d-12 have an idealbackhaul network or an unideal backhaul network. Accordingly, when anideal backhaul network 1 d-13 is provided, fast inter-base station X2communication 1 d-13 is possible such that, even if the uplinktransmission is transmitted only to the LTE base station 1 d-11, the 5Gbase station 1 d-12 can receive related control information from the LTEbase station 1 d-11 through the X2 communication 1 d-13 in real time. Inthe system of the lower figure of FIG. 1D, the LTE cell and the 5G cellmay have multiple serving cells and may support a total of 32 servingcells. The base station 1 d-11 or 1 d-12 can control and operate the LTEsystem and the 5G system in real time. For example, when the basestation 1 d-11 divides time resources and operates the LTE system andthe 5G system at different times, it is possible to dynamically selectallocation of time resources to the LTE system and to the 5G system andto transmit the corresponding signal to the other base station 1 d-12through X2. By receiving a signal that indicates allocation of resources(for example, time resources, frequency resources, antenna resources, orspace resources) that are separately operated by the LTE cell and the 5Gcell from the LTE base station 1 d-11 or the 5G base station 1 d-12, theterminal 1 d-14 can be aware of which resources are used totransmit/receive data from the LTE cell 1 d-11 and the 5G cell 1 d-12.

Meanwhile, when the LTE base station 1 d-11 and the 5G base station 1d-12 have an unideal backhaul network 1 d-13, fast inter-base station X2communication 1 d-13 is impossible. Accordingly, the base station 1 d-11or 1 d-12 can operate the LTE system and the 5G system semi-statically.For example, when the base station 1 d-11 divides time resources andoperate the LTE system and the 5G system at different times, resourcesfor the LTE system and the 5G system can be divided by selectingallocation of time resources to the LTE system and the 5G system andtransmitting the corresponding signal to the other base station 1 d-12through X2 in advance. By receiving a signal that indicates allocationof resources (for example, time resources, frequency resources, antennaresources, or space resources) that are separately operated by the LTEcell and the 5G cell from the LTE station 1 d-11 or the 5G base station1 d-12, the terminal 1 d-14 can be aware of which resources are used totransmit/receive data from the LTE cell 1 d-11 and the 5G cell 1 d-12.

Terms such as “physical channels” and “signals” in a conventional LTE orLTE-A system may be used to describe methods and devices proposed inembodiments. However, the content of the disclosure is applicable in awireless communication system, not LTE and LTE-A systems.

In addition, the technology proposed in the disclosure is applicable notonly in FDD and TDD systems, but also in a new type of duplex mode (forexample, LTE frame structure type 3).

As used in the disclosure, “upper-level signaling” or “upper-levelsignal” refers to a signal transfer method wherein a base stationtransfers a signal to a terminal by using a downlink data channel of aphysical layer, or the terminal transfers a signal to the base stationby using an uplink data channel of the physical layer, and denotestransfer of signals between the base station and the terminal through atleast one method of RRC signaling, PDCP signaling, or MAC controlelement (MAC CE).

Embodiment 1-1

A network or a base station (hereinafter, referred to as a base station)may transmit at least one piece of control information among schedulinginformation regarding downlink data transmission and schedulinginformation regarding uplink data transmission to a terminal through adownlink control channel with regard to each subframe, slot, mini-slot,or TTI (hereinafter, referred to as a slot). That is, the terminal maymonitor whether or not there is scheduling information regardingdownlink data transmission or scheduling information regarding uplinkdata transmission, which is transmitted to the terminal through adownlink control channel with regard to each subframe or each slot; andwhen the terminal succeeds in receiving downlink scheduling informationor uplink scheduling configuration information transmitted to theterminal through the downlink control channel, the terminal may receivedownlink data according to the received scheduling configurationinformation or may transmit an uplink signal of at least one of uplinkdata or uplink control information to the base station.

More specifically, the terminal may monitor up/downlink schedulinginformation transmitted through a downlink control channel in the entirefrequency band or in downlink control channel monitoring time andfrequency domains (hereinafter, referred to as downlink control channelmonitoring domains), which are defined in advance, or which areconfigured through a signaling/channel of at least one of a group-commoncontrol channel or a UE-specific control channel transmitted from thebase station through an upper-level signal, PBCH, SIB, or downlinkcontrol channel, with regard to each subframe, each slot, eachmini-slot, or each TTI (hereinafter, referred to as a slot). Forexample, the downlink control channel monitoring frequency domain may beconfigured through an upper-level signal, and the downlink controlchannel monitoring time domain may be configured by a configurationvalue of a specific field of the group-common control channel or theUE-specific control channel; for example, the downlink control channelmonitoring time domain may be configured by a control field indicator(CFI) value. The downlink control channel monitoring time domain maychange for each slot.

The base station may configure up/downlink scheduling informationtransmitted by the terminal through the downlink control channel suchthat the monitoring cycle, interval, or timepoint (hereinafter, referredto as a timepoint) is longer than each slot, thereby minimizing powerconsumed by the terminal to monitor the up/downlink schedulinginformation transmitted through the downlink control channel. Themonitoring timepoint regarding the up/downlink scheduling informationtransmitted through the downlink control channel may be configured forthe terminal by the base station through at least one of thegroup-common control channel or the UE-specific control channel, whichis transmitted through an upper-level signal or downlink controlchannel. When the base station has configured, for the terminal, themonitoring timepoint regarding the up/downlink scheduling informationtransmitted through the upper-level signal through the downlink controlchannel, the terminal may perform monitoring regarding the up/downlinkscheduling information transmitted through the downlink control channelin each slot immediately before the configuration through theupper-level signal (RRC configuration or RRC reconfiguration) iscompleted, or immediately before the terminal transmits an upper-levelsignal configuration completion message or ACK/NACK information to thebase station.

A more detailed description will now be made with reference to FIG. 1E.FIG. 1E illustrates a situation to be resolved by the disclosure.Although an embodiment of the disclosure, including FIG. 1E, will bedescribed with reference to a slot 1 e-01, the slot 1 e-01 may be asubframe or a TTI.

The base station may configure the timepoint at which the terminalmonitors up/downlink scheduling information transmitted through downlinkcontrol channels such that the terminal monitors up/downlink schedulinginformation transmitted through the downlink control channels 1 e-09, 1e-10, 1 e-11, 1 e-12, 1 e-13, 1 e-14, and 1 e-15 in all slots 1 e-02, 1e-03, 1 e-04, 1 e-05, 1 e-06, 1 e-07, and 1 e-08 in which downlinktransmission is performed. Alternatively, the base station may configurethe timepoint at which the terminal monitors up/downlink schedulinginformation transmitted through a downlink control channel such that, bytransmitting at least one value of a cycle (T_(PDCCH)) value 1 e-17 andan offset (Δ_(PDCCH)) value 1 e-16 from a specific reference slot to theterminal through an upper-level signal, an SIB, or a group-commoncontrol channel, the up/downlink scheduling information transmittedthrough the downlink control channels 1 e-10 and 1 e-14 is monitoredonly in specific slots 1 e-03 and 1 e-07; alternatively, the basestation may transmit a bit string based on the length of one frame ormore than one frames to the terminal through an upper-level signal so asto configure timepoints 1 e-03, 1 e-05, and 1 e-07 for monitoring theup/downlink scheduling information transmitted through the downlinkcontrol channel within the length of the one frame or more than oneframes. The terminal may configure the timepoint, at which theup/downlink scheduling information transmitted through the downlinkcontrol channel configured by the bit string is monitored, repeatedly orperiodically with reference to the length of one frame or more than oneframes.

When the base station configures the timepoint, at which the up/downlinkscheduling information transmitted to the terminal through the downlinkcontrol channel is monitored, by using the cycle or bit string, theconfigured monitoring timepoint may be applied only to up/downlinkscheduling information transmitted through the UE-specific controlchannel, and may not be applied to up/downlink scheduling informationtransmitted through the group-common control channel. The terminalmonitors the up/downlink scheduling information transmitted from thebase station through the group-common control channel with regard toeach slot. It is also possible to differently configure the timepoint atwhich the up/downlink scheduling information transmitted through theUE-specific control channel is monitored and the timepoint at which theup/downlink scheduling information transmitted through the group-commoncontrol channel is monitored. In other words, it is possible todifferently configure, through a separate field, the bit string value orat least one value of the cycle value and the offset value regarding thetimepoint at which the up/downlink scheduling information transmittedthrough the UE-specific control channel is monitored, and the bit stringvalue or at least one value of the cycle value and the offset valueregarding the timepoint at which the up/downlink scheduling informationtransmitted through the group-common control channel is monitored.

Assuming that, as in the method proposed by the above embodiment, thebase station transfers the timepoint at which up/downlink schedulinginformation transmitted through a downlink control channel to theterminal through an upper-level signal, SIB, or group-common controlchannel by at least one method using at least one of the cycle(T_(PDCCH)) value 1 e-17 and the offset (Δ_(PDCCH)) value 1 e-16 from aspecific reference slot, a bit string, or a set of slot indexes {1 f-03,1 f-07} for monitoring the up/downlink scheduling information such thatthe up/downlink scheduling information transmitted through the downlinkcontrol channels 1 f-10 and 1 f-14 is monitored only in specific slots 1f-03 and 1 f-07, the terminal then does not receive the schedulinginformation in the slots 1 f-02, 1 f-04, 1 f-05, 1 f-06, and 1 f-08 inwhich the scheduling information is not monitored, and the base stationmay accordingly fail to configure or schedule uplink data transmissionor downlink data reception for the terminal in the slots 1 f-02, 1 f-04,1 f-05, 1 f-06, and 1 f-08 in which the scheduling information is notmonitored. Accordingly, when the base station configures at least oneslot as the timepoint at which up/downlink scheduling informationtransmitted through the downlink control channel is monitored asmentioned above, not only the up/downlink scheduling information 1 f-20at the timepoint 1 f-03 at which the up/downlink scheduling informationis monitored, but also the up/downlink scheduling information 1 f-21, 1f-22, and 1 f-23 in the slots 1 f-02, 1 f-04, 1 f-05, 1 f-06, and 1 f-08in which the scheduling information is not monitored need to beadditionally transferred at the timepoints 1 f-03 and 1 f-07 configuredfor the terminal to monitor the up/downlink scheduling information.Accordingly, when the base station configures at least one slot as thetimepoint at which up/downlink scheduling information transmittedthrough the downlink control channel is monitored as mentioned above,the up/downlink scheduling information needs to include informationregarding the time for the terminal to perform uplink data transmissionor downlink data reception operations, for example, informationregarding a slot index used to perform uplink data transmission ordownlink data reception.

In other words, when the base station has configured, for the terminal,at least one slot as the timepoint at which up/downlink schedulinginformation transmitted through the downlink control channel ismonitored as described above, the size of up/downlink schedulinginformation that the terminal needs to receive or the bit number of theup/downlink scheduling information is larger than the size ofup/downlink scheduling information that the terminal needs to receive orthe bit number of the up/downlink scheduling information when the basestation has not additionally configured the timepoint at whichup/downlink scheduling information transmitted through the downlinkcontrol channel is monitored, at least by the size of slot indexinformation included to transfer up/downlink scheduling information 1f-21, if-22, and 1 f-23 in the slots 1 f-02, 1 f-04, 1 f-05, 1 f-06, and1 f-08 in which the scheduling information is not monitored, the size ofscheduling time information, or the bit number of the up/downlinkscheduling information. Accordingly, when the base station hasconfigured, for the terminal, at least one slot as the timepoint atwhich up/downlink scheduling information transmitted through thedownlink control channel is monitored as described above, the basestation needs to monitor the up/downlink scheduling information assumingthat the same is larger than the size of up/downlink schedulinginformation that the terminal needs to receive or the bit number of theup/downlink scheduling information when the base station has notadditionally configured the timepoint at which up/downlink schedulinginformation transmitted through the downlink control channel ismonitored, at least by the size of slot index information, the size ofscheduling time information, or the bit number of the up/downlinkscheduling information. As used in the disclosure and embodiments, thesize of slot index information or scheduling time information refers tothe number of bits necessary to configure the slot index information orthe up/downlink scheduling time information.

The terminal may add the size of slot index information or schedulingtime information or the bit number of up/downlink scheduling informationto information regarding configuration of the timepoint at whichup/downlink scheduling information transmitted from the base station tothe terminal through the downlink control channel is monitored. In otherwords, the base station may additionally inform of the bit string size Nof slot index information or scheduling time information throughconfiguration information transmitted by the base station to configurethe up/downlink scheduling information monitoring timepoint, such as atleast one value of the cycle (T_(PDCCH)) value 1 e-17 and the offset(Δ_(PDCCH)) value 1 f-16 from a specific reference slot, a bit string,or information regarding a set of slot indexes {if-03, 1 f-07} formonitoring the up/downlink scheduling information. If the size of slotindex information or scheduling time information or the bit number ofup/downlink scheduling time information is additionally transferred tothe information regarding configuration of the timepoint at whichup/downlink scheduling information transmitted is monitored as describedabove, the terminal, after receiving the configuration information,monitors the up/downlink scheduling information, which is increased bythe size of slot index information or scheduling time information or thebit number of up/downlink scheduling time information included in theconfiguration, at the configured monitoring timepoint.

As another method, the terminal may transmit the size of slot indexinformation or scheduling time information or the bit number ofup/downlink scheduling information through a group-common downlinkcontrol channel that the base station transmits to the terminal. If thesize of slot index information or scheduling time information or the bitnumber of up/downlink scheduling information is transmitted through agroup-common downlink control channel, the terminal, after receiving theconfiguration information, monitors the up/downlink schedulinginformation, which is increased by the size of slot index information orscheduling time information or the bit number of up/downlink schedulinginformation included in the configuration, at the configured monitoringtimepoint.

As another method, without transmitting the size of slot indexinformation or scheduling time information or the bit number thereofthrough additional information, the terminal may be configured todetermine the size of slot index information or scheduling timeinformation or the bit number thereof. If the base station transmits theup/downlink scheduling information monitoring timepoint to the terminalthrough at least one value of the cycle (T_(PDCCH)) value 1 f-17 and theoffset (Δ_(PDCCH)) value 1 f-16 from a specific reference slot, theconfigured cycle (T_(PDCCH)) value 1 f-17 may be used such that theterminal determines the size of slot index information or schedulingtime information or the bit number thereof without transmitting the sizeof slot index information or scheduling time information or the bitnumber thereof through additional information. In other words, theterminal may determine the size of slot index information or schedulingtime information or the bit number thereof with reference to the cycle(T_(PDCCH)) as the up/downlink scheduling information monitoringtimepoint configured by the base station. For example, when theconfigured cycle (T_(PDCCH)) value 1 f-17 is configured as one of valuesexpressed by exponent products of 2, the terminal may determine that thesize of slot index information or scheduling time information is thecycle (T_(PDCCH)) value 1 f-17 or log₂ (cycle (T_(PDCCH)) value 1 f-17),without transmitting the size of slot index information or schedulingtime information or the bit number thereof through additionalinformation. If the configured cycle (T_(PDCCH)) value 1 f-17 isconfigured as one of normal integer values, not a value expressed by anexponent product of 2, the terminal may determine the size of slot indexinformation or scheduling time information or the bit number thereof byrounding up the log₂ (cycle (T_(PDCCH)) value 1 f-17) value (or ceilingor _(┌)log₂ (cycle (T_(PDCCH)) value 1 f-17)_(┐)) without transmittingthe size of slot index information or scheduling time information or thebit number thereof through additional information. It is also possibleto make a definition such that the terminal determines the size of slotindex information or scheduling time information or the bit numberthereof by rounding down the log₂ (cycle (T_(PDCCH)) value 1 f-17) valuewith regard to the received cycle value (or ^(└)log₂ (cycle (T_(PDCCH))value 1 f-17)^(┘)) or by rounding off the same.

As another method, the terminal may transmit the size of slot indexinformation or scheduling time information without transmitting the sizeof slot index information or scheduling time information throughadditional information. A more detailed description will be made withreference to FIG. 1G. Although it will be assumed in the descriptionwith reference to FIG. 1G that the base station configures theup/downlink scheduling information monitoring timepoint through a bitstring for the terminal, the same is applicable not only to a case ofusing a bit string, but also to a case of informing of a set of slotindexes {1 g-20, 1 g-22, 1 g-24, 1 g-26} for monitoring the up/downlinkscheduling information. If the base station transmits the up/downlinkscheduling information monitoring timepoint to the terminal through abit string 1 g-11 with reference to a specific length 1 g-01 (forexample, the length of one frame or more than one frames), the size ofslot index information or scheduling time information may be determinedwith reference to the largest distance 1 g-03 among the distancesbetween slots 1 g-20, 1 g-22, 1 g-24, and 1 g-26 or bit stringsconfigured to monitor the up/downlink scheduling information such thatthe terminal can determine the size of slot index information orscheduling time information without transmitting additional informationregarding the size of slot index information or scheduling timeinformation by the base station. In other words, the terminal maydetermine the size of slot index information or scheduling timeinformation with reference to the largest distance (D_(PDCCH) 1 g-03)among the distances between slots 1 g-20, 1 g-22, 1 g-24, and 1 g-26 orbit strings configured to monitor the up/downlink schedulinginformation, and the terminal may perform up/downlink schedulinginformation, the determined size of slot index information or schedulingtime information being added to the size thereof, at the configuredmonitoring timepoint. The terminal may determine the size of slot indexinformation or scheduling time information by rounding up the log₂(distance (D_(PDCCH)) value 1 f-03) value (or ceiling or _(┌)log₂(distance (D_(PDCCH)) value_(┐)). It is also possible to make adefinition such that the terminal determines the size of slot indexinformation or scheduling time information by rounding down the log_(e)(distance (D_(PDCCH)) value) value with regard to the received cyclevalue (or ^(└)log₂ (distance (D_(PDCCH)) value)^(┘)) or by rounding offthe same.

The terminal may determine the size of slot index information orscheduling time information with reference to the smallest distance(D_(PDCCH) 1 g-05) among the distances between slots 1 g-20, 1 g-22, 1g-24, and 1 g-26 or bit strings configured to monitor the up/downlinkscheduling information, and the terminal may perform up/downlinkscheduling information, the determined size of slot index information orscheduling time information being added to the size thereof, at theconfigured monitoring timepoint. The terminal may determine the size ofslot index information or scheduling time information by rounding up thelog₂ (distance (D_(PDCCH)) value 1 f-03) value (or ceiling or _(┌)log₂(distance (D_(PDCCH)) value_(┐)). It is also possible to make adefinition such that the terminal determines the size of slot indexinformation or scheduling time information by rounding down the log₂(distance (D_(PDCCH)) value) value with regard to the received cyclevalue (or ^(└)log₂ (distance (D_(PDCCH)) value)^(┘)) or by rounding offthe same.

The terminal may determine the size of slot index information orscheduling time information with reference to respective distancesbetween slots 1 g-20, 1 g-22, 1 g-24, and 1 g-26 or bit stringsconfigured to monitor the up/downlink scheduling information, and theterminal may perform up/downlink scheduling information, the determinedsize of slot index information or scheduling time information beingadded to the size thereof, at the configured monitoring timepoint. Thatis, the terminal may determine the size of slot index information orscheduling time information with reference to the distance (D_(PDCCH))value 1 g-05) between slots 1 g-22 and 1 g-24 or bit strings configuredto monitor the up/downlink scheduling information, and the terminal mayperform up/downlink scheduling information, the determined size of slotindex information or scheduling time information being added to the sizethereof, at the configured monitoring timepoint 1 g-22. In slot 1 g-24,the terminal may determine the size of slot index information orscheduling time information with reference to the distance value 1 g-07between slots 1 g-24 and 1 g-26 or bit strings configured to monitor theup/downlink scheduling information, and the terminal may performup/downlink scheduling information, the determined size of slot indexinformation or scheduling time information being added to the sizethereof, at the configured monitoring timepoint 1 g-24. The terminal maydetermine the size of slot index information or scheduling timeinformation by rounding up the log₂ (distance (D_(PDCCH)) value 1 f-03)value (or ceiling or _(┌)log₂ (distance (D_(PDCCH)) value_(┐)). It isalso possible to make a definition such that the terminal determines thesize of slot index information or scheduling time information byrounding down the log_(e) (distance (D_(PDCCH)) value) value with regardto the received cycle value (or ^(└)log₂ (distance (D_(PDCCH))value)^(┘)) or by rounding off the same.

The terminal may determine the determined value of slot indexinformation or scheduling time information by expressing successivescheduling time information in a slot or TTI unit in a slot or TTI formonitoring up/downlink scheduling information. For example, when theup/downlink scheduling time information includes two bits, the terminalmay determine that 00 of the two bits indicates a slot (for example,slot n) for monitoring the up/downlink scheduling information, 01indicates a slot (slot n+1) next to the slot for monitoring theup/downlink scheduling information, 10 indicates a slot (slot n+2) twoslots away from the slot for monitoring the up/downlink schedulinginformation, and 11 indicates a slot (n+3) three slots away from theslot for monitoring the up/downlink scheduling information. The basestation may configure actual up/downlink scheduling time informationindicated by the determined slot index information or scheduling timeinformation through an upper-level signal for the terminal;alternatively, the base station may configure actual up/downlinkscheduling time information indicated by the determined slot indexinformation or scheduling time information through offset informationbased on the slot for monitoring the up/downlink scheduling information.For example, when the up/downlink scheduling time information includestwo bits, the base station may determine, for the terminal, that 00 ofthe two bits indicates a slot (for example, slot n) for monitoring theup/downlink scheduling information, 01 indicates a slot (slot n+2)second next to the slot for monitoring the up/downlink schedulinginformation, 10 indicates a slot (slot n+3) three slots away from to theslot for monitoring the up/downlink scheduling information, and 11indicates a slot (n+5) five slots away from the slot for monitoring theup/downlink scheduling information. The actual up/downlink schedulingtime information configured by the base station is only an example, andis not limiting in any manner. The base station may fix and use, withoutany configuration, at least one piece of information of the actualup/downlink scheduling time information indicated by the slot indexinformation or scheduling time information. For example, when theup/downlink scheduling time information includes two bits, the basestation and the terminal may assume that 00 of the two bits alwaysindicates a slot (for example, slot n) for monitoring the up/downlinkscheduling information such that the actual up/downlink scheduling timeinformation indicated by slot index information or scheduling timeinformation transmitted through the upper-level signal, or the actualup/downlink scheduling time information indicated by slot indexinformation or scheduling time information is transmitted afterexcluding one piece of information of the offset information based onthe slot for monitoring the up/downlink scheduling information, therebyminimizing transmission of unnecessary information.

Embodiment 1-2

Compared with the method proposed by Embodiment 1-1 wherein one piece ofup/downlink scheduling information can be configured to receive anuplink control signal regarding one or more slots (N slots) or TTIs,data transmission, a downlink control signal, or a data signal,Embodiment 1-2 is directed to a method for transmitting the up/downlinkscheduling time information proposed by Embodiment 1-1 and the number(N) of slots scheduled by the up/downlink scheduling information moreefficiently.

If the base station transmits the up/downlink scheduling informationmonitoring timepoint to the terminal by a method using at least one ofthe cycle (T_(PDCCH)) value and the offset (Δ_(PDCCH)) value from aspecific reference slot, a bit string, or a set of slot indexes formonitoring the up/downlink scheduling information, the terminal maydetermine the size of slot index information or scheduling timeinformation or the bit number thereof by using at least one of themethods proposed in Embodiment 1-1, and the terminal may monitor thedetermined size of slot index information or scheduling timeinformation, or the up/downlink scheduling information, which isincreased by the bit number of the up/downlink scheduling timeinformation, at the configured monitoring timepoint. If the terminal canbe configured such that one piece of up/downlink scheduling informationcan receive an uplink control signal regarding one or more slots (Nslots, N_(slot)) or TTIs, data transmission, a downlink control signal,or a data signal from the base station, the terminal may monitor, at theconfigured monitoring timepoint, the up/downlink scheduling information,the size or bit number of which is increased by the bit number (forexample, _(┌)log₂ (N_(slot)) value_(┐)) necessary to indicateadditionally scheduled slot number information added to the determinedsize of slot index information or scheduling time information or to thebit number of up/downlink scheduling time information.

An increase in the bit number of the up/downlink scheduling informationmay be minimized by considering both the size of slot index informationor scheduling time information or the bit number of up/downlinkscheduling time information and the bit number necessary to indicatescheduled slot number information.

FIG. 1H will be referred to in the following description. If the basestation has configured the terminal to monitor the up/downlinkscheduling information in one or more slots or TTIs (n and n+6), or theup/downlink scheduling information monitoring timepoint is larger thanthe minimum scheduling unit of the terminal or the minimum transmissionunit thereof, and if one piece of up/downlink scheduling information canbe configured to receive an uplink control signal regarding one or moreslots (N slots, N_(slot)) or TTIs, data transmission, a downlink controlsignal, or a data signal, then the increase in the bit number of theup/downlink scheduling information may be minimized by considering boththe size of slot index information or scheduling time information or thebit number of up/downlink scheduling time information and the bit numbernecessary to indicate scheduled slot number information. The maximumvalue of N_(slot) may be configured to be equal to or smaller than thenumber of slots or TTIs that can be included in the up/downlinkscheduling information monitoring timepoint period (T_(PDCCH)) that isconfigured by the base station or defined in advance, or configured tobe equal to or smaller than the number of slots or TTIs that can beincluded in the distance (D_(PDCCH)) between up/downlink schedulinginformation monitoring timepoints. In addition, the one or morescheduled slots may not exceed up/downlink scheduling informationmonitoring timepoints or slots. In other words, the N_(slot) value maybe transmitted from the base station while being additionally includedin configuration information configured such that one piece ofup/downlink scheduling information receives an uplink control signalregarding one or more slots or TTIs, data transmission, a downlinkcontrol signal, or a data signal; alternatively, the N_(slot) value maybe determined without adding configuration information on the basis ofthe number of slots that can be included in the up/downlink schedulinginformation monitoring timepoint cycle (T_(PDCCH)) included inconfiguration information for configuring the timepoint at whichup/downlink scheduling information is monitored, or the number of slotsthat can be included in the distance (D_(PDCCH)) between up/downlinkscheduling information monitoring timepoints. FIG. 1H illustrates a casewherein the maximum number of N_(slot) (N_(slot) ^(max)) is equal to thenumber of slots that can be included in the configured or definedup/downlink scheduling information monitoring timepoint cycle(T_(PDCCH)) 1 h-01. In FIG. 1H, there are a total of 21 cases whereinthe base station can perform up/downlink scheduling to the terminalwithin the up/downlink scheduling information monitoring timepointcycle, and five bits are necessary to select one from the 21 cases.Accordingly, if the up/downlink scheduling time information and thescheduled slot number information are considered together as proposed bythe disclosure, the increase in the number of bits added to theup/downlink scheduling information can be minimized compared with thecase of separately considering the up/downlink scheduling timeinformation and the scheduled slot number information.

As in FIG. 1H, the terminal's uplink control signal or data transmissiontime and the number of transmission slots, or the downlink controlsignal or data signal reception time and the number of reception slotsmay be determined on the basis of the following equation by usingup/downlink scheduling time information (a slot or TTI for startingtransmission of an uplink control signal or data, or a slot or TTI forreceiving a downlink control signal or data signal, T_(start), 1 h-08)and the number of scheduled slots (N_(slot)) 1 h-09 or the lengththereof, and by using the RIV value calculated by Equation 1 below:

$\begin{matrix}{{{{{If}\mspace{14mu} \left( {N_{slot} - 1} \right)} \leq \left\lfloor \frac{T_{PDCCH}}{2} \right\rfloor},{{RIV} = {{T_{PDCCH}\left( {N_{slot} - 1} \right)} + T_{start}}}}{{Else},{{RIV} = {{T_{PDCCH}\left( {N_{slot} - T_{start} - 1} \right)} + T_{PDCCH} - 1 - T_{start}}}}} & \left\lbrack {{Equation}\mspace{14mu} 1} \right\rbrack\end{matrix}$

If the terminal can start transmitting an uplink control signal or dataor can receive a downlink control signal or data signal after a specifictime T_(min) 1 h-11 from the timepoint at which up/downlink schedulinginformation is received, the up/downlink scheduling time information andscheduled slot number information may be determined in view of the time1 h-11. The time 1 h-11 may be defined by the capability of theterminal, and the base station, after receiving the capability regardingthe time 1 h-11 of the terminal, may configure the terminal'sup/downlink scheduling time in view of the time 1 h-11. If the time 1h-11 is considered, N_(slot) ^(max)=N_(slot) ^(max)−T_(min) and Equation1 above may be changed to Equation 2 below:

$\begin{matrix}{{{{{If}\mspace{14mu} \left( {N_{slot} - 1} \right)} \leq \left\lfloor \frac{T_{PDCCH} - T_{\min}}{2} \right\rfloor},{{RIV} = {{\left( {T_{PDCCH} - T_{\min}} \right)\left( {N_{slot} - 1} \right)} + T_{start}}}}{{Else},{{RIV} = {{\left( {T_{PDCCH} - T_{\min}} \right)\left( {N_{slot} - T_{start} - 1} \right)} + \left( {T_{PDCCH} - T_{\min}} \right) - 1 - T_{start}}}}} & \left\lbrack {{Equation}\mspace{14mu} 2} \right\rbrack\end{matrix}$

The terminal may determine the number of bits necessary to transfer thenumber of all cases that can be scheduled from the base station as inFIG. 1H, and may determine the bit number of the monitored up/downlinkscheduling information by assuming the determined number of bits. If thebase station transmits, to the terminal, up/downlink scheduling timeinformation (a slot or TTI for starting transmission of an uplinkcontrol signal or data, or a slot or TTI for receiving a downlinkcontrol signal or data signal, T_(start)) and the number of slots(N_(slot)) that can be scheduled by using the following equation, thenumber of bits necessary to transmit the scheduling information may bedetermined as └log₂((T_(PDCCH))T_(PDCCH))/2┘.

Embodiment 1-3

Compared with the methods proposed by Embodiment 1-1 and Embodiment 1-2wherein one piece of up/downlink scheduling information can beconfigured to receive an uplink control signal regarding one or moreslots (N slots) or TTIs, data transmission, a downlink control signal,or a data signal, Embodiment 1-3 is directed to a method for configuringthe up/downlink scheduling time information proposed by Embodiment 1-1and Embodiment 1-2 and the number (N) of slots scheduled by theup/downlink scheduling information according to control channeltransmission domain information in a slot in which the up/downlinkscheduling information is transmitted.

If the base station transmits the up/downlink scheduling informationmonitoring timepoint to the terminal by a method using at least one ofthe cycle (T_(PDCCH)) value and the offset (Δ_(PDCCH)) value from aspecific reference slot, a bit string, or a set of slot indexes formonitoring the up/downlink scheduling information, the terminal maydetermine the size of slot index information or scheduling timeinformation or the bit number thereof by using at least one of themethods proposed in Embodiment 1-1, and the terminal may monitor thedetermined size of slot index information or scheduling timeinformation, or the up/downlink scheduling information, which isincreased by the bit number of the up/downlink scheduling timeinformation, at the configured monitoring timepoint. If the terminal canbe configured such that one piece of up/downlink scheduling informationcan receive an uplink control signal regarding one or more slots (Nslots, N_(slot)) or TTIs, data transmission, a downlink control signal,or a data signal from the base station, the terminal may monitor, at theconfigured monitoring timepoint, the up/downlink scheduling information,the size or bit number of which is increased by the bit number (forexample, _(┌)log₂ (N_(slot)) value_(┐)) necessary to indicateadditionally scheduled slot number information added to the determinedsize of slot index information or scheduling time information or to thebit number of up/downlink scheduling time information.

The increase in the bit number of the up/downlink scheduling informationmay be minimized by considering both the size of slot index informationor scheduling time information or the bit number of up/downlinkscheduling time information and the bit number necessary to indicatescheduled slot number information.

FIG. 1H will be referred to in the following description. If the basestation has configured the terminal to monitor the up/downlinkscheduling information in one or more slots or TTIs (n and n+6), or theup/downlink scheduling information monitoring timepoint is larger thanthe minimum scheduling unit of the terminal or the minimum transmissionunit thereof, and if one piece of up/downlink scheduling information canbe configured to receive an uplink control signal regarding one or moreslots (N slots, N_(slot)) or TTIs, data transmission, a downlink controlsignal, or a data signal, then the increase in the bit number of theup/downlink scheduling information may be minimized by considering boththe size of slot index information or scheduling time information or thebit number of up/downlink scheduling time information and the bit numbernecessary to indicate scheduled slot number information. The maximumvalue of N_(slot) may be configured to be equal to or smaller than thenumber of slots or TTIs that can be included in the up/downlinkscheduling information monitoring timepoint period (T_(PDCCH)) that isconfigured by the base station or defined in advance, or configured tobe equal to or smaller than the number of slots or TTIs that can beincluded in the distance (D_(PDCCH)) between up/downlink schedulinginformation monitoring timepoints. In addition, the one or morescheduled slots may not exceed up/downlink scheduling informationmonitoring timepoints or slots. In other words, the N_(slot) value maybe transmitted from the base station while being additionally includedin configuration information configured such that one piece ofup/downlink scheduling information receives an uplink control signalregarding one or more slots or TTIs, data transmission, a downlinkcontrol signal, or a data signal; alternatively, the N_(slot) value maybe determined without adding configuration information on the basis ofthe number of slots that can be included in the up/downlink schedulinginformation monitoring timepoint cycle (T_(PDCCH)) included inconfiguration information for configuring the timepoint at whichup/downlink scheduling information is monitored, or the number of slotsthat can be included in the distance (D_(PDCCH)) between up/downlinkscheduling information monitoring timepoints. FIG. 1H illustrates a casewherein the maximum number of N_(slot) (N_(slot) ^(max)) is equal to theslots that can be included in the configured or defined up/downlinkscheduling information monitoring timepoint cycle (T_(PDCCH)) 1 h-01. InFIG. 1H, there are a total of 21 cases wherein the base station canperform up/downlink scheduling to the terminal within the up/downlinkscheduling information monitoring timepoint cycle, and five bits arenecessary to select one from the 21 cases. Accordingly, if theup/downlink scheduling time information and the scheduled slot numberinformation are considered together as proposed by the disclosure, theincrease in the number of bits added to the up/downlink schedulinginformation can be minimized compared with the case of separatelyconsidering the up/downlink scheduling time information and thescheduled slot number information.

As in FIG. 1H, the terminal's uplink control signal or data transmissiontime and the number of transmission slots, or the downlink controlsignal or data signal reception time and the number of reception slotsmay be determined on the basis of the following Equation 3 by usingup/downlink scheduling time information (a slot or TTI for startingtransmission of an uplink control signal or data, or a slot or TTI forreceiving a downlink control signal or data signal, T_(start), 1 h-08)and the number of scheduled slots (N_(slot)) 1 h-09 or the lengththereof, and by using the RIV value calculated by Equation 3 below:

$\begin{matrix}{{{{{If}\mspace{14mu} \left( {N_{slot} - 1} \right)} \leq \left\lfloor \frac{T_{PDCCH}}{2} \right\rfloor},{{RIV} = {{T_{PDCCH}\left( {N_{slot} - 1} \right)} + T_{start}}}}{{Else},{{RIV} = {{T_{PDCCH}\left( {N_{slot} - T_{start} - 1} \right)} + T_{PDCCH} - 1 - T_{start}}}}} & \left\lbrack {{Equation}\mspace{14mu} 3} \right\rbrack\end{matrix}$

If the terminal can start transmitting an uplink control signal or dataor can receive a downlink control signal or data signal after a specifictime T_(min) 1 h-11 from the timepoint at which up/downlink schedulinginformation is received, the up/downlink scheduling time information andscheduled slot number information may be determined in view of the time1 h-11. The time 1 h-11 may be defined by the capability of theterminal, and the base station, after receiving the capability regardingthe time 1 h-11 of the terminal, may configure the terminal'sup/downlink scheduling time in view of the time 1 h-11. If the time 1h-11 is considered, N_(slot) ^(max)=_(slot) ^(max)−T_(min) and Equation3 above may be changed to Equation 4 below:

$\begin{matrix}{{{{{If}\mspace{14mu} \left( {N_{slot} - 1} \right)} \leq \left\lfloor \frac{T_{PDCCH} - T_{\min}}{2} \right\rfloor},{{RIV} = {{\left( {T_{PDCCH} - T_{\min}} \right)\left( {N_{slot} - 1} \right)} + T_{start}}}}{{Else},{{RIV} = {{\left( {T_{PDCCH} - T_{\min}} \right)\left( {N_{slot} - T_{start} - 1} \right)} + \left( {T_{PDCCH} - T_{\min}} \right) - 1 - T_{start}}}}} & \left\lbrack {{Equation}\mspace{14mu} 4} \right\rbrack\end{matrix}$

If the number of symbols used to transmit a downlink control channel inslot n or TTI n in which the up/downlink scheduling information istransmitted is equal to the number of symbols included in slot n or TTIn in which the up/downlink scheduling information is transmitted, inother words, if it is confirmed that symbols in slot n or TTI n in whichup/downlink scheduling information is transmitted are all used totransmit up/downlink scheduling information, the up/downlink schedulingtime information (a slot or TTI for starting transmission of an uplinkcontrol signal or data, or a slot or TTI for receiving a downlinkcontrol signal or data signal, T_(start)) that the base station canconfigure for the terminal and the number of slots N_(slot) that can bescheduled or the number of schedulable cases change as in FIG. H.Accordingly, in Embodiment 3, the terminal may determine the number ofsymbols used to transmit up/downlink scheduling information in slot n orTTI n in which up/downlink scheduling information is transmitted, and ifit is it confirmed that symbols in slot n or TTI n in which up/downlinkscheduling information is transmitted are all used to transmitup/downlink scheduling information, the terminal may determine thenumber of bits necessary to transfer the number of scheduling casesexcept for the case in which scheduling is impossible as in FIG. H. Ifthe base station transmits, to the terminal, up/downlink scheduling timeinformation (a slot or TTI for starting transmission of an uplinkcontrol signal or data, or a slot or TTI for receiving a downlinkcontrol signal or data signal, T_(start)) and the number of slots(N_(slot)) that can be scheduled by using the following Equation 5, thenumber of bits necessary to transmit the scheduling information may bedetermined as └log₂((T_(PDCCH)−1)T_(PDCCH))/2)┘.

$\begin{matrix}{{{{If}\mspace{14mu} \left( {N_{slot} - 1} \right)} \leq \left\lfloor \frac{T_{PDCCH} - 1}{2} \right\rfloor},{{RIV} = {{\left( {T_{PDCCH} - 1} \right)\left( {N_{slot} - 1} \right)} + {T_{start}{Else}}}},{{RIV} = {{\left( {T_{PDCCH} - 1} \right)\left( {N_{slot} - T_{start} - 1} \right)} + \left( {T_{PDCCH} - 1} \right) - 1 - T_{start}}}} & \left\lbrack {{Equation}\mspace{14mu} 5} \right\rbrack\end{matrix}$

If the terminal determines the number of symbols used to transmitup/downlink scheduling information in slot n or TTI n in whichup/downlink scheduling information is transmitted, and if it is itconfirmed that all symbols in slot n or TTI n in which up/downlinkscheduling information is transmitted are not used to transmitup/downlink scheduling information, the terminal may determine thenumber of bits necessary to transfer the number of scheduling caseswhere scheduling is possible as in FIG. 1H, and may determine the bitnumber of the monitored up/downlink scheduling information by assumingthe determined number of bits. If the base station transmits, to theterminal, up/downlink scheduling time information (a slot or TTI forstarting transmission of an uplink control signal or data, or a slot orTTI for receiving a downlink control signal or data signal, T_(start))and the number of slots (N_(slot)) that can be scheduled by using thefollowing Equation 6, the number of bits necessary to transmit thescheduling information may be determined as└log₂((T_(PDCCH))T_(PDCCH))/2┘.

$\begin{matrix}{{{{{If}\mspace{14mu} \left( {N_{slot} - 1} \right)} \leq \left\lfloor \frac{T_{PDCCH}}{2} \right\rfloor},{{RIV} = {{T_{PDCCH}\left( {N_{slot} - 1} \right)} + T_{start}}}}{{Else},{{RIV} = {{T_{PDCCH}\left( {N_{slot} - T_{start} - 1} \right)} + T_{PDCCH} - 1 - T_{start}}}}} & \left\lbrack {{Equation}\mspace{14mu} 6} \right\rbrack\end{matrix}$

The terminal may determine the number (control field indicator (CFI)) ofsymbols used to transmit up/downlink scheduling information in slot n orTTI n in which up/downlink scheduling information is transmitted byreceiving a channel that transmits the number of symbols used totransmit the up/downlink scheduling information, such as a PCFICH, or byusing the value of CFI included in the group-common control channel orUE-specific control channel. The CFI value in slot n or TTI n in whichup/downlink scheduling information is transmitted may be defined inadvance or configured through an upper-level signal.

Second Embodiment

The disclosure relates to a wireless communication system and, moreparticularly, to a method and a device wherein different wirelesscommunication systems coexist in one carrier frequency or multiplecarrier frequencies, and a terminal capable of transmitting/receivingdata in at least one communication system among the differentcommunication systems transmits/receives data to/from each communicationsystem.

In general, a mobile communication system is developed to provide voiceservices while guaranteeing the mobility of users. The wirelesscommunication system has gradually expanded its service scope from voiceto data services and, in recent years, has evolved to such a degree thatit can provide high-speed data services. However, since resources areinsufficient and users demand faster services in mobile communicationsystems currently providing services, a more developed mobilecommunication system is needed.

To meet such demands, standardization of long-term evolution (LTE) isunder way by the 3rd Generation Partnership Project (3GPP) as one of thenext-generation mobile communication systems that are being developed.LTE is a technology of implementing high-speed packet-basedcommunication with a transmission rate of up to about 100 Mbps. To thisend, several methods are discussed, including a method of reducing thenumber of nodes located on a communication path by simplifying thenetwork architecture, a method of making wireless protocols closest tothe wireless channel, and the like.

When decoding fails at the initial transmission, the LTE system employsa hybrid automatic repeat reQuest (HARQ) scheme that retransmits thecorresponding data in a physical layer. According to the HARQ scheme,when the receiver fails to accurately decode data, the receivertransmits information that indicates decoding failure (negativeacknowledgement (NACK)) to the transmitter such that the transmitter canretransmit the corresponding data in the physical layer. The receivercombines data retransmitted by the transmitter with data, the decodingof which has previously failed, thereby improving the data receptionperformance. Also, when the receiver accurately decodes data, thereceiver may transmit information that indicates successful decoding(acknowledgement (ACK)) to the transmitter such that the transmitter cantransmit new data.

FIG. 2A illustrates the basic structure of a time-frequency domain,which is a radio resource domain where data or a control channel istransmitted in a downlink of an LTE system.

In FIG. 2A, the horizontal axis indicates the time domain, and thevertical axis indicates the frequency domain. The smallest transmissionunit in the time domain is an OFDM symbol, N_(symb) OFDM symbols 2 a-02constitute one slot 2 a-06, and two slots constitute one subframe 2a-05. The length of each slot is 0.5 ms, and the length of each subframeis 1.0 ms. The radio frame 2 a-14 is a time-domain unit including tensubframes. The smallest transmission unit in the frequency domain is asubcarrier, and the bandwidth of the entire system transmissionbandwidth includes a total of N_(BW) subcarriers 2 a-04.

In the time-frequency domain, the basic resource unit is a resourceelement (RE) 2 a-12, which may be expressed by an OFDM symbol index anda subcarrier index. A resource block (RB) (or physical resource block(PRB) 2 a-08 is defined by N_(symb) consecutive OFDM symbols 2 a-02 inthe time domain and N_(RB) consecutive subcarriers 2 a-10 in thefrequency domain. Therefore, one RB 2 a-08 includes N_(symb)×N_(RB) REs2 a-12. Generally, the minimum transmission unit of data is the RB unit.In the LTE system, generally, N_(symb)=7 and N_(RB)=12, and N_(BW) andN_(RB) are proportional to the bandwidth of the system transmissionband. The data rate increases in proportion to the number of RBs thatare scheduled to the terminal. An LTE system defines and operates sixtransmission bandwidths. In the case of an FDD system that separatelyoperates the downlink and the uplink on the basis of frequency, thedownlink transmission bandwidth and the uplink transmission bandwidthmay differ from each other. The channel bandwidth denotes an RFbandwidth corresponding to the system transmission bandwidth. Table 2provided below indicates the correlation between a system transmissionbandwidth and a channel bandwidth defined in the LTE system. Forexample, in the case of an LTE system having a channel bandwidth of 10MHz, the transmission bandwidth includes 50 RBs.

TABLE 2 Channel 1.4 3 5 10 15 20 bandwidth BW_(channel) [MHz]Transmission 6 15 25 50 75 100 bandwidth configuration

Downlink control information is transmitted within the initial N OFDMsymbols inside the subframe. In general, N={1,2,3}. Therefore, the valueof N may be changed for each subframe based on the amount of controlinformation to be transmitted in the current subframe. The controlinformation includes a control channel transmission interval indicatorindicating the number of OFDM symbols across which control informationis transmitted, scheduling information associated with downlink data oruplink data, a HARQ ACK/NACK signal, or the like.

In the LTE system, scheduling information associated with downlink dataor uplink data is transmitted from a base station to a terminal viadownlink control information (DCI). “uplink (UL)” refers to a wirelesslink through which the terminal transmits data or a control signal tothe base station, and “downlink (DL)” refers to a wireless link throughwhich the base station transmits data or a control signal to theterminal. The DCI is defined in various formats such that a DCI formatis applied and employed based on a definition regarding whether the sameindicates scheduling information regarding uplink data (uplink (UL)grant) or scheduling information regarding downlink data (downlink (DL)grant), whether or not the same indicates compact DCI having a smallcontrol information size, whether or not spatial multiplexing usingmultiple antennas is applied, and whether or not the same indicates DCIfor power control. For example, DCI format 1 corresponding to schedulingcontrol information regarding downlink data (DL grant) is configured toinclude at least the following pieces of control information.

-   -   Resource allocation type 0/1 flag: indicates whether the        resource allocation scheme is type 0 or type 1. Type 0 applies a        bitmap scheme and allocates resources in units of resource block        groups (RBGs). In the LTE system, the basic unit of scheduling        is a resource block (RB) expressed by time and frequency domain        resources, and an RBG includes multiple RBs and is used as a        basic unit of scheduling in the type 0 scheme.    -   Resource block assignment: indicates RBs assigned to data        transmission. Expressed resources are determined according to        the system bandwidth and the resource allocation scheme.    -   Modulation and coding scheme (MCS): indicates the modulation        scheme used for data transmission and the size of the transport        block, which is the data to be transmitted.    -   HARQ process number: indicates the process number of the HARQ.    -   New data indicator: indicates HARQ initial transmission or        retransmission.    -   Redundancy version: indicates the redundancy version of the        HARQ.    -   Transmit power control (TPC) command for physical uplink control        channel (PUCCH): indicates a transmit power control command        regarding a PUCCH, which is an uplink control channel.

The DCI undergoes channel coding and modulation processes and istransmitted through a physical downlink control channel (PDCCH), whichis a downlink physical control channel, or through an enhanced PDCCH(EPDCCH).

In general, the DCI is channel-coded independently of each terminal, andis then transmitted through each independently configured PDCCH. In thetime domain, the PDCCH is mapped and transmitted during the controlchannel transmission interval. The frequency-domain mapping position ofthe PDCCH is determined by the identifier (ID) of each terminal, and isdistributed across the entire system transmission band.

The downlink data is transmitted through a physical downlink sharedchannel (PDSCH), which is a physical channel dedicated to downlink datatransmission. The PDSCH is transmitted after the control channeltransmission interval, and scheduling information such as the specificmapping position in the frequency domain and the modulation schemeindicates the DCI transmitted through the PDCCH.

By using an MCS including five bits among the control informationconstituting the DCI, the base station notifies the terminal of themodulation scheme applied to the PDSCH to be used for transmission andthe size of the data to be transmitted (transport block size (TBS)). TheTBS corresponds to the size before channel coding for error correctionis applied to the data (transport block (TB)) to be transmitted by thebase station.

The modulation scheme supported by the LTE system includes quadraturephase shift keying (QPSK), 16 quadrature amplitude modulation (QAM), and64QAM, and modulation orders (Q_(M)) thereof correspond to 2, 4, and 6,respectively. That is, in the case of the QPSK modulation, 2 bits can betransmitted per symbol; in the case of the 16QAM modulation, 4 bits canbe transmitted per symbol; and in the case of 64QAM modulation, 6 bitscan be transmitted per symbol.

Compared with LTE Rel-8, 3GPP LTE Rel-10 has adopted a bandwidthextension technology in order to support a larger amount of datatransmission. The technology referred to as “bandwidth extension” or“carrier aggregation (CA)” can increase the amount of data transmissionin proportion to the extended bandwidth, compared with an LTE Rel-8terminal that extends the bandwidth and transmits data in one band. Eachof the bands is referred to as a component carrier (CC), and an LTERel-8 terminal is required to have one CC for each of downlink anduplink transmissions. In addition, the downlink CC and the uplink CC,which is connected thereto by SIB-2, are collectively referred to as acell. The SIB-2 connectivity between the downlink CC and the uplink CCis transmitted as a system signal or an upper-level signal. A terminalsupporting the CA can receive downlink data and can transmit uplink datathrough multiple serving cells.

When a base station has difficulty sending a physical downlink controlchannel (PDCCH) to a specific terminal in a specific serving cell underRel-10, the base station may transmit the PDCCH in another serving celland may configure a carrier indicator field (CIF) as a field informingthat the corresponding PDCCH indicates a physical downlink sharedchannel (PDSCH) or a physical uplink shared channel (PUSCH) of anotherserving cell. The CIF may be configured for a terminal supporting theCA. The CIF has been determined such that three bits can be added toPDCCH information in a specific serving cell so as to indicate anotherserving cell, the CIF is included only when cross-carrier scheduling isperformed, and the cross-carrier scheduling is not performed when theCIF is not included. When the CIF is included in downlink assignmentinformation (DL assignment), the CIF indicates a serving cell in which aPDSCH scheduled by the DL assignment is to be transmitted; and when theCIF is included in uplink resource assignment information (UL grant),the CIF is defined to indicate a serving cell in which a PUSCH scheduledby the UL grant is to be transmitted.

As described above, carrier aggregation (CA) is defined as a bandwidthextension technology in LTE-10 such that multiple serving cells can beconfigured for a terminal. The terminal transmits channel informationregarding the multiple serving cells to the base station periodically oraperiodically for the purpose of data scheduling of the base station.The base station schedules data for each carrier and transmits the same,and the terminal transmits A/N feedback regarding data transmitted withregard to each carrier. LTE Rel-10 is designed such that a maximum of 21bits of A/N feedback is transmitted, and when A/N feedback transmissionand channel information transmission overlap in one subframe, the A/Nfeedback is transmitted, and the channel information is discarded. LTERel-11 is designed such that channel information of one cell ismultiplexed together with A/N feedback such that a maximum of 22 bits ofA/N feedback and channel information of one cell are transmitted throughPUCCH format 3 by using a transmission resource of PUCCH format 3.

LTE-13 assumes a scenario wherein a maximum of 32 serving cells isconfigured, and establishes a concept wherein bands not only in alicensed band, but also in an unlicensed band are used to extend thenumber of serving cells to a maximum of 32. In addition, considering thefact that the number of licensed bands is limited as in the case of theLTE frequency, providing an LTE service in an unlicensed band such as 5GHz band has been completed, and is referred to as licensed assistedaccess (LAA). The LAA applies carrier aggregation technology in the LTEand supports operating an LTE cell, which is a licensed band, as a PCelland operating an LAA cell, which is an unlicensed band, as an SCell.Accordingly, a feedback occurring in the LAA cell, which is an SCell,needs to be transmitted only in the PCell as in the case of LTE, and thedownlink subframe and the uplink subframe can be freely applied to theLAA cell. Unless otherwise specified in the specification, “LTE” as usedherein includes all advanced technologies of LTE, such as LTE-A and LAA.

Meanwhile, the 5^(th)-generation wireless cellular communication system(hereinafter, referred to as 5G or NR), which is a post-LTEcommunication system, needs to be able to freely accommodate variousrequirements of the user, the service provider, and the like, and aservice satisfying such various requirements can be providedaccordingly.

Therefore, 5G may be defined as technology for satisfying requirementsselected for various 5G-oriented services, among the requirements suchas a maximum terminal transmission rate of 20 Gbps, a maximum terminalspeed of 500 km/h, a maximum latency of 0.5 ms, and a terminal accessdensity of 1,000,000 terminals/km², in connection with various5G-oriented services such as enhanced mobile broadband (hereinafter,referred to as eMBB), massive machine-type communication (hereinafter,referred to as mMTC), ultra-reliable and low-latency communications(hereinafter, referred to as URLLC).

For example, in order to provide eMBB in 5G, one base station needs tobe able to provide a maximum terminal transmission rate of 20 Gbps inthe downlink, and a maximum terminal transmission rate of 10 Gbps in theuplink. At the same time, the average transmission rate that is actuallyexperienced by the terminal needs to be increased. In order to satisfysuch a requirement, it is necessary to improve thetransmission/reception technology, including a further improvedmultiple-input multiple-output transmission technology.

At the same time, mMTC is considered for use in supporting anapplication service such as Internet of things (IoT) in 5G. In order toefficiently provide IoT, mMTC is required to meet requirements such assupport for large-scale terminal access in a cell, terminal coverageimprovement, improved battery time, and terminal cost reduction. A largenumber of terminals (for example, 1,000,000 terminals/km²) needs to besupported in a cell such that the same are attached to various sensorsand devices to provide communication functions according to IoT. Inaddition, mMTC is required to have a coverage larger than that providedby eMBB because, due to the service characteristics, terminals arelikely to be positioned in coverage holes, such as a basement of abuilding, where cell coverage fails. Since mMTC is likely to beconfigured by inexpensive terminals, and since it is difficult tofrequently replace the batteries of the terminals, a very long batterylifetime is required.

Lastly, in the case of URLLC, it is required to provide cellular-basedwireless communication used for a specific purpose, specifically,communication that provides ultra-low latency and ultra-high reliabilityin connection with services used for remote control of a robot ormachinery, industrial automation, unmanned aerial vehicles, remotehealth control, and emergency notifications. For example, URLLC has therequirement that the maximum latency be shorter than 0.5 ms, and that apacket error rate equal to or less than 10⁻⁵ be provided. Accordingly,URLLC has the design requirement that the same provide a transmit timeinterval (TTI) smaller than that of a 5G service such as eMBB, and alarge resource be allocated in the frequency band.

The services considered in the 5^(th)-generation wireless cellularcommunication system described above need to be provided as a singleframework. That is, for the purpose of efficient resource management andcontrol, respective services are preferably integrated into a singlesystem, controlled, and transmitted, instead of being operatedindependently.

FIG. 2B illustrates an example of multiplexing services considered in 5Ginto one system and transmitting the same.

In FIG. 2B, the frequency-time resource 2 b-01 used by 5G may include afrequency axis 2 b-02 and a time axis 2 b-03. FIG. 2B illustrates anexample wherein, inside one framework, 5G operates eMBB 2 b-05, mMTC 2b-06, and URLLC 2 b-07. It is also possible to consider, as a servicethat can be additionally considered in 5G, an enhanced mobilebroadcast/multicast service (eMBMS) 2 b-08 for providing acellular-based broadcasting service. Services considered in 5G, such aseMBB 2 b-05, mMTC 2 b-06, URLLC 2 b-07, and eMBMS 2 b-08, may bemultiplexed and transmitted by means of time-division multiplexing (TDM)or frequency division multiplexing (FDM) inside one system frequencybandwidth operated by 5G, and it is also possible to consider spatialdivision multiplexing. In the case of eMBB 2 b-05, it is preferred tooccupy and transmit the maximum frequency bandwidth at a specificarbitrary time in order to provide the above-mentioned increased datatransmission rate. Accordingly, the service of eMBB 2 b-05 is preferablysubjected to TDM with other services and transmitted within the systemtransmission bandwidth 2 b-01, but the same is also preferably subjectedto FDM with other services and transmitted within the systemtransmission bandwidth, as required by other services.

In the case of mMTC 2 b-06, an increased transmission interval isrequired to secure a wide coverage unlike other services, and thecoverage can be secured by repeatedly transmitting the same packetinside the transmission interval. At the same time, there is a limit onthe transmission bandwidth that a terminal can receive in order toreduce the complexity and price of the terminal. In view of suchrequirements, the mMTC 2 b-06 is preferably subjected to TDM with otherservices and transmitted within the system transmission bandwidth 2 b-01of 5G.

In order to satisfy the ultra-latency requirement required by services,URLLC 2 b-07 preferably has a short transmit time interval (TTI)compared with other services. At the same time, the same preferably hasa large bandwidth in terms of frequency because a low coding rate isnecessary to satisfy the ultra-latency requirement. In view of suchrequirements of URLLC 2 b-07, the URLLC 2 b-07 is preferably subjectedto TDM with other services within the transmission system bandwidth 2b-01 of 5G.

Respective services described above may have differenttransmission/reception techniques and transmission/reception parametersin order to satisfy requirements required by respective services. Forexample, respective services may have different numerologies accordingto respective service requirements. As used herein, the numerologyincludes the length of a cyclic prefix (CP), the subcarrier spacing, thelength of an OFDM symbol, and the length of a TTI in a communicationsystem based on orthogonal frequency division multiplexing (OFDM) ororthogonal frequency division multiple access (OFDMA). As an example ofhaving different numerologies between services, eMBMS 2 b-08 may have aCP length longer than that of other services. Since eMBMS transmitsbroadcast-based upper-level traffic, the same may transmit the same datain all cells. From the viewpoint of a terminal, if signals received inmultiple cells arrive within the CP length, the terminal can receive anddecode all of the signals and thus can obtain single frequency network(SFN) diversity gain; accordingly, there is an advantage in that even aterminal positioned at a cell boundary can receive broadcast informationwith no coverage limit. However, when the CP length is longer than thatof other services in connection with providing eMBMS in 5G, the CPoverhead generates waste, a longer OFDM symbol length is accordinglyrequired than that of other services, and a narrower subcarrier spacingis also required than that of other services.

As another example of using different numerologies between services in5G, URLLC may require a smaller TTI than that of other services, ashorter OFDM symbol length may be accordingly required, and a largersubcarrier spacing may also be required.

Meanwhile, one TTI in 5G may be defined as one slot, and may include 14OFDM symbols or 7 OFDM symbols. Accordingly, in the case of subcarrierspacing at 15 KHz, one slot has a length of 1 ms or 0.5 ms. In addition,for the purpose of emergency transmission and transmission in anunlicensed band in 5G, one TTI may be defined as one mini-slot orsub-slot, and one mini-slot may have OFDM symbols, the number of whichranges from 1 to ((number of OFDM symbols of the slot)−1). For example,if the length of one slot corresponds to 14 OFDM symbols, the length ofone mini-slot may be determined from 1-13 OFDM symbols. The length ofthe slot or mini-slot may be defined by standards, or may be transmittedby an upper-level signal or system information and received by theterminal.

The slot or mini-slot may be defined to have various transmissionformats, and may have formats classified as below:

-   -   DL-only slot or full-DL slot: a DL-only slot includes only a DL        interval, and supports only DL transmission.    -   DL-centric slot: a DL-centric slot includes a DL interval, a GP,        and a UL interval, and the number of OFDM symbols of the DL        interval is larger than the number of OFDM symbols of the UL        interval.    -   UL-centric slot: a UL-centric slot includes a DL interval, a GP,        and a UL interval, and the number of OFDM symbols of the DL        interval is smaller than the number of OFDM symbols of the UL        interval.    -   UL-only slot or full-UL slot: a UL-only slot includes only a UL        interval, and supports only UL transmission.

Although slot formats have solely been classified above, mini-slots mayalso be classified in the same manner That is, mini-slots may beclassified into a DL-only mini-slot, a DL-centric mini-slot, aUL-centric mini-slot, and a UL-only mini-slot.

According to the format of the slot or mini-slot, the transmission startsymbol and end symbol of UL/DL data may vary. The disclosure provides ascheme wherein, in order to transmit/receive UL/DL data to/from a basestation through the slot or mini-slot of a terminal, the start symboland end symbol (or interval) of data are indicated to the terminal, andthe terminal receives the values, thereby transmitting/receiving datathrough the slot or min-slot.

Hereinafter, preferred embodiments of the disclosure will be describedin detail with reference to the accompanying drawings. Here, it is notedthat identical reference numerals denote the same constituent elementsin the accompanying drawings. Further, a detailed description of a knownfunction and configuration which may make the subject matter of thedisclosure unclear will be omitted.

Further, although the following detailed description of embodiments ofthe disclosure will be directed to LTE and 5G systems, it can beunderstood by those skilled in the art that the main gist of thedisclosure may also be applied to any other communication systems havingsimilar technical backgrounds and channel types, with a slightmodification, without substantially departing from the scope of thedisclosure.

Hereinafter, a 5G system for performing data transmission/reception inthe 5G cell will be described.

FIG. 2C illustrates a first embodiment of a communication system towhich the disclosure is applied. The drawings illustrate a type in whicha 5G system is operated, and schemes proposed by the disclosure areapplicable to the system of FIG. 2C.

Referring to FIG. 2C, FIG. 2CA illustrates a case wherein a 5G cell 2c-02 is operated by one base station 2 c-01 in a network. The terminal 2c-03 is a 5G-capable terminal having a 5G transmission/reception module.The terminal 2 c-03 acquires synchronization through a synchronizationsignal transmitted in the 5G cell 2 c-02, receives system information,and transmits/receives data to/from the base station 2 c-01 through the5G cell 2 c-02. In this case, there is no limit on the duplex type ofthe 5G cell 2 c-02. If the 5G cell is the PCell, uplink controltransmission is transmitted through the 5G cell 2 c-02. In the system of5 c, the 5G cell may include multiple serving cells and may support atotal of 32 serving cells. It is assumed that the base station 2 c-01 inthe network has a 5G transmission/reception module (system), and thebase station 2 c-01 can control and operate the 5G system in real time.

Next, a procedure of the base station 2 c-01 configuring a 5G resourceand transmitting/receiving data to/from the 5G-capable terminal 2 c-03in the resource for 5G will be described.

In step 2 c-11 of FIG. 2CB, the base station 2 c-01 transmitssynchronization for 5G, system information, and upper-levelconfiguration information to the 5G-capable terminal 2 c-03. Inconnection with the synchronization signal for 5G, a separatesynchronization signal may be transmitted for eMBB, mMTC, or URLLC thatuses a different numerology, and it is also possible to transmit asynchronization signal common to a specific 5G resource by using asingle numerology. In connection with the system information, a singlenumerology may be used to transmit a system signal common to a specific5G resource, and separate system information may be transmitted foreMBB, mMTC, or URLLC that uses a different numerology. The systeminformation and upper-level configuration information may includeconfiguration information regarding whether a slot or a mini-slot willbe used to transmit/receive data, and may include the number of OFDMsymbols of the slot or mini-slot and a numerology. When DL commoncontrol channel reception is configured for the terminal, the systeminformation and upper-level configuration information may includeconfiguration information regarding the DL common control channelreception.

In step 2 c-12, the base station 2 c-01 transmits/receives data for a 5Gservice to/from the 5G-capable terminal 2 c-03 in the 5G resource.

Next, a procedure of the 5G-capable terminal 2 c-03 receiving a 5Gresource configuration from the base station 2 c-01 andtransmitting/receiving data in the 5G resource will be described.

In step 2 c-21 of FIG. 2CB, the 5G-capable terminal 2 c-03 acquiressynchronization from a synchronization signal for 5G transmitted by thebase station 2 c-01, and receives system information and upper-levelconfiguration information transmitted by the base station 2 c-01. Inconnection with the synchronization signal for 5G, a separatesynchronization signal may be transmitted for eMBB, mMTC, or URLLC thatuses a different numerology, and it is also possible to transmit asynchronization signal common to a specific 5G resource by using asingle numerology. In connection with the system information, a singlenumerology may be used to transmit a system signal common to a specific5G resource, and separate system information may be transmitted foreMBB, mMTC, or URLLC that uses a different numerology. The systeminformation and upper-level configuration information may includeconfiguration information regarding whether a slot or a mini-slot willbe used to transmit/receive data, and may include the number of OFDMsymbols of the slot or mini-slot and a numerology. When DL commoncontrol channel reception is configured for the terminal, the systeminformation and upper-level configuration information may includeconfiguration information regarding the DL common control channelreception.

In step 2 c-22, the 5G-capable terminal 2 c-03 transmits/receives datafor a 5G service to/from the base station 2 c-01 in the 5G resource.

The following description concerns a scheme wherein, when the 5G systemof FIG. 2C is operated by using a slot or mini-slot, a terminal isinformed of the time symbol position of UL/DL data, which may varydepending on the transmission format, and the terminaltransmits/receives data on the basis of the position.

FIG. 2D illustrates the (2-1)^(th) embodiment in the disclosure.

It is to be noted that, although a scheme will be described withreference to FIG. 2D wherein a terminal determines the start symbolposition and end symbol position (or interval length) of DL data andreceives a DL data channel on the basis of a slot, the disclosure isalso applicable to a case wherein a terminal determines the start symbolposition and end symbol position (or interval length) of DL data andreceives a DL data channel on the basis of a mini-slot.

In FIG. 2D, 2 d-01 refers to a DL control channel, and may be aterminal-common control channel or a terminal-specific control channel.The terminal-common control channel includes pieces of information thatcan be commonly indicated to terminals, such as information regardingthe format of the slot or mini-slot. The terminal-specific controlchannel includes pieces of terminal-specific information, such asinformation regarding the position of the data transmission frequencyfor UL/DL data scheduling.

In FIG. 2D, 2 d-02 denotes a DL data channel, and the data channelincludes DL data and an RS necessary to transmit/receive the DL data.

In FIG. 2D, 2 d-03 denotes time and frequency domains in which DLtransmission is possible inside a slot.

In FIG. 2D, 2 d-04 denotes time and frequency domains in which ULtransmission is possible inside a slot.

In FIG. 2D, 2 d-05 denotes time and frequency domains necessary tochange the RF from DL to UL inside a slot.

Firstly, a situation will be described wherein, in a DL-only slot 2 d-11of a slot interval 2 d-06, the start OFDM symbol and end OFDM symbol (orinterval length) of DL data need to be indicated to the terminal. Timeand frequency domains are illustrated, in which a DL control channel 2d-01 and a DL data channel 2 d-02 are transmitted in the DL-only slot 2d-11 of FIG. 2D, and the DL data channel 2 d-02 may be multiplexed withthe DL control channel 2 d-01 that schedules DL data either in the timedomain or in the frequency domain. Accordingly, the terminal needs to beaware of the OFDM symbol position in which the DL data 2 d-02 starts andthe OFDM symbol position (or interval length) in which the same ends.

Next, a situation will be described wherein, in a DL-centric slot 2 d-21of a slot interval 2 d-06, the start OFDM symbol and end OFDM symbol (orinterval length) of DL data need to be indicated to the terminal. Timeand frequency domains are illustrated, in which a DL control channel 2d-01 and a DL data channel 2 d-02 are transmitted in the DL-centric slot2 d-21 of FIG. 2D, and the DL data channel 2 d-02 may be multiplexedwith the DL control channel 2 d-01 that schedules DL data either in thetime domain or in the frequency domain. In addition, the end part of theDL-centric slot 21-21 includes a GP 2 d-05 and an UL transmissioninterval 2 d-04, and the DL data channel 2 d-02 cannot be transmitted inthe interval. Accordingly, the terminal needs to be aware of the OFDMsymbol position in which the DL data 2 d-02 starts and the OFDM symbolposition (or interval length) in which the same ends.

Two schemes proposed by the (2-1)^(th) embodiment of the disclosure inconnection with the above-mentioned situations are as follows:

1) A method to be applied to a case wherein a terminal always receives aterminal-common control channel, or a case wherein a terminal receivesan upper-level signal configuration that enables detection of aterminal-common control channel and then detects a terminal-commoncontrol channel, will be described. OFDM symbols 2 d-12 and 2 d-22, atwhich DL data starts, are indicated by a terminal-specific controlchannel that schedules DL data. The terminal receives, from the X-bitfield of the terminal-specific control channel, information regardingfrom which OFDM symbol of the DL-only slot 2 d-11 DL data is positioned.OFDM symbols (or interval length) 2 d-13 and 2 d-23, at which DL dataends, are estimated from a terminal-common control channel thatindicates the slot format. The slot format includes informationregarding what format the slot has, the number of OFDM symbols of the DLinterval, the number of OFDM symbols of the GP, and the number of OFDMsymbols of the UL interval. For example, it is determined that, in thecase of a DL-only slot having a DL interval including 14 OFDM symbols,DL data ends at the 14th OFDM symbol. For example, it is determinedthat, in the case of a DL-centric slot having a DL interval includingten OFDM symbols, a GP including one OFDM symbol, and a UL intervalincluding three OFDM symbols, DL data ends at the 10^(th) OFDM symbol.Accordingly, the terminal determines that DL data is transmitted up tothe last of the OFDM symbols of the DL interval of the slot formatindicated by the terminal-common control channel.

Although a situation has been described above wherein DL data isscheduled only in one slot, the following schemes may be applied to acase wherein DL data is scheduled to be transmitted in multiple slots,or a case of semi-persistent scheduling.

-   -   According to the first scheme, a DL data start OFDM symbol        received from an X-bit field of a terminal-specific control        channel, which schedules the first DL data, and the end OFDM        symbol determined from the slot format of the terminal-common        control channel, are also applied to DL data reception through        subsequent slots. Accordingly, the terminal receives DL data by        applying the same DL data start OFDM symbol and the same end        OFDM symbol (or interval length) in multiple slots.    -   According to the second scheme, a DL data start OFDM symbol        received from an X-bit field of a terminal-specific control        channel, which schedules the first DL data, is also applied to        DL data reception through subsequent slots, and, if the        terminal-common control channel informs of slot formats        regarding subsequent channels, end OFDM symbols determined from        respective slot formats are applied to subsequent slots,        respectively. Accordingly, the terminal receives DL data by        applying, in multiple slots, the same DL data start OFDM symbol        and end OFDM symbols (or interval lengths) that are different        for respective slots.

2) A method to be applied to a case wherein a terminal receives anupper-level signal configuration that instructs the terminal not todetect a terminal-common control channel, and thus does not detect aterminal-common control channel, will be described. OFDM symbols 2 d-12and 2 d-22, at which DL data starts, are indicated by aterminal-specific control channel that schedules DL data. The terminalreceives, from the X-bit field of the terminal-specific control channel,information regarding from which OFDM symbol of the DL-only slot 2 d-11DL data is positioned. OFDM symbols (or interval length) 2 d-13 and 2d-23, at which DL data ends, are estimated from a terminal-specificchannel that indicates the slot format. The slot format includesinformation regarding what format the slot has, the number of OFDMsymbols of the DL interval, the number of OFDM symbols of the GP, andthe number of OFDM symbols of the UL interval. For example, it isdetermined that, in the case of a DL-only slot having a DL intervalincluding 14 OFDM symbols, DL data ends at the 14^(th) OFDM symbol. Forexample, it is determined that, in the case of a DL-centric slot havinga DL interval including ten OFDM symbols, a GP including one OFDMsymbol, and a UL interval including three OFDM symbols, DL data ends atthe 10^(th) OFDM symbol. Accordingly, the terminal determines that DLdata is transmitted up to the last of the OFDM symbols of the DLinterval of the slot format indicated by the terminal-specific controlchannel.

Although a situation has been described above wherein DL data isscheduled only in one slot, the following schemes may be applied to acase wherein DL data is scheduled to be transmitted in multiple slots,or a case of semi-persistent scheduling.

-   -   According to the first scheme, a DL data start OFDM symbol        received from an X-bit field of a terminal-specific control        channel, which schedules the first DL data, and the end OFDM        symbol determined from the slot format of the terminal-specific        control channel, are also applied to DL data reception through        subsequent slots. Accordingly, the terminal receives DL data by        applying the same DL data start OFDM symbol and the same end        OFDM symbol (or interval length) in multiple slots.    -   According to the second scheme, a DL data start OFDM symbol        received from an X-bit field of a terminal-specific control        channel, which schedules the first DL data, is also applied to        DL data reception through subsequent slots, and, if the        terminal-specific control channel informs of slot formats        regarding subsequent channels, end OFDM symbols determined from        respective slot formats are applied to subsequent slots,        respectively. Accordingly, the terminal receives DL data by        applying, in multiple slots, the same DL data start OFDM symbol        and end OFDM symbols (or interval lengths) that are different        for respective slots.

FIG. 2E illustrates a base station procedure and a terminal procedureregarding the (2-1)^(th) embodiment of the disclosure.

Firstly, the base station procedure will be described.

In step 2 e-11, the base station transmits terminal-common controlchannel and terminal-specific control channel configuration informationto the terminal.

In step 2 e-12, the base station transmits a terminal-common controlchannel and a terminal-specific control channel to the terminal in viewof the slot format and DL data channel scheduling. The terminal-commoncontrol channel and a terminal-specific control channel includeinformation regarding the start OFDM symbol and end OFDM symbol (orinterval length) of the DL data channel as illustrated with reference toFIG. 2D.

Next, the terminal procedure will be described.

In step 2 e-21, the terminal receives terminal-common control channeland terminal-specific control channel configuration information from thebase station.

In step 2 e-22, the terminal receives a terminal-common control channeland a terminal-specific control channel from the base station anddetermines the start OFDM symbol and end OFDM symbol (or intervallength) of the DL data channel from the terminal-common control channeland the terminal-specific control channel. When a specific terminal isconfigured not to receive the terminal-common control channel, the samereceives only the terminal-specific control channel and determines thestart OFDM symbol and end OFDM symbol (or interval length) of the DLdata channel. The terminal-common control channel and theterminal-specific control channel include information regarding thestart OFDM symbol and end OFDM symbol (or interval length) of the DLdata channel as illustrated with reference to FIG. 2D.

FIG. 2F illustrates the (2-2)^(th) embodiment in the disclosure.

It is to be noted that, although a scheme will be described withreference to FIG. 2F wherein a terminal determines the start symbolposition and end symbol position (or interval length) of UL data andtransmits a UL data channel on the basis of a slot, the disclosure isalso applicable to a case wherein a terminal determines the start symbolposition and end symbol position (or interval length) of DL data andtransmits a UL data channel on the basis of a mini-slot.

In FIG. 2F, 2 f-01 refers to a DL control channel, and may be aterminal-common control channel or a terminal-specific control channel.The terminal-common control channel includes pieces of information thatcan be commonly indicated to terminals, such as information regardingthe format of the slot or mini-slot. The terminal-specific controlchannel includes pieces of terminal-specific information, such asinformation regarding the position of the data transmission frequencyfor UL/DL data scheduling.

In FIG. 2F, 2 f-02 denotes a UL data channel, and the data channelincludes UL data and an RS necessary to transmit/receive the UL data.

In FIG. 2F, 2 f-03 denotes a UL control channel, and the control channelincludes UL control information and an RS necessary to transmit/receivethe UL control information.

In FIG. 2F, 2 f-04 denotes time and frequency domains in which DLtransmission is possible inside a slot.

In FIG. 2F, 2 f-05 denotes time and frequency domains in which ULtransmission is possible inside a slot.

In FIG. 2F, 2 f-06 denotes time and frequency domains necessary tochange the RF from DL to UL inside a slot.

Firstly, a situation will be described wherein, in a UL-centric slot 2f-21 of a slot interval 2 f-07, the start OFDM symbol and end OFDMsymbol (or interval length) of DL data need to be indicated to theterminal. Time and frequency domains are illustrated, in which a DLcontrol channel 2 f-01, a UL data channel 2 f-02, and a UL controlchannel 2 f-03 are transmitted in the UL-centric slot 2 f-11 of FIG. 2F.The UL data channel 2 f-02 can start transmission in the UL interval 2f-05 and, since the time and frequency domains of the UL control channel2 f-03 of other terminals cannot be known, the base station needs toinform one terminal of the range of OFDM symbols within the UL interval2 f-05 of one slot, in which the terminal can transmit the UL datachannel 2 f-02, so as to avoid collision with the time and frequencydomains of the UL control channel 2 f-03 of other terminals.Accordingly, the terminal needs to be aware of the OFDM symbol positionin which the UL data 2 f-02 starts and the OFDM symbol position (orinterval length) in which the same ends.

Next, a situation will be described wherein, in a UL-only slot 2 f-21 ofa slot interval 2 f-07, the start OFDM symbol and end OFDM symbol (orinterval length) of UL data need to be indicated to the terminal. Timeand frequency domains are illustrated, in which a UL data channel 2 f-02and a UL control channel 2 f-03 are transmitted in the UL-only slot 2f-21 of FIG. 2F. The UL data channel 2 f-02 can start transmission fromthe first OFDM symbol of the UL interval 2 f-05 and, since the time andfrequency domains of the UL control channel 2 f-03 of other terminalscannot be known, the base station needs to inform one terminal of therange of OFDM symbols within the UL interval 2 f-05 of one slot, inwhich the terminal can transmit the UL data channel 2 f-02, so as toavoid collision with the time and frequency domains of the UL controlchannel 2 f-03 of other terminals. Although not illustrated in thedrawing, it is also necessary to inform one terminal of the OFDM symbolsthat can be used to transmit the UL data channel 2 f-02, due to thesounding reference signal (SRS) transmission time and frequency domainsof terminals. Accordingly, the terminal needs to be aware of the OFDMsymbol position in which the UL data 2 f-02 starts and the OFDM symbolposition (or interval length) in which the same ends.

Two schemes proposed by the (2-2)^(th) embodiment of the disclosure inconnection with the above-mentioned situations are as follows:

1) A method to be applied to a case wherein a terminal always receives aterminal-common control channel, or a case wherein a terminal receivesan upper-level signal configuration that enables detection of aterminal-common control channel and then detects a terminal-commoncontrol channel, will be described. OFDM symbols 2 f-12 and 2 f-22, atwhich UL data starts, are estimated from the terminal-common controlchannel that indicates the slot format. The slot format includesinformation regarding what format the slot has, the number of OFDMsymbols of the DL interval, the number of OFDM symbols of the GP, andthe number of OFDM symbols of the UL interval. For example, it isdetermined that, in the case of a UL-only slot having a UL intervalincluding 14 OFDM symbols, UL data is transmitted at the first OFDMsymbol. For example, it is determined that, in the case of a UL-centricslot having a DL interval including three OFDM symbols, a GP includingone OFDM symbol, and a UL interval including ten OFDM symbols, UL datais transmitted at the fifth OFDM symbol. Accordingly, the terminaldetermines that UL data is transmitted from the start OFDM symbol of theUL interval of the slot format indicated by the terminal-common controlchannel. The OFDM symbols (or interval length) 2 f-13 and 2 f-23, atwhich the UL data ends, are indicated by a terminal-specific controlchannel that schedules UL data. The terminal receives, from the Y-bitfield of the terminal-specific control channel, information regardingthe range of OFDM symbols of the UL-centric slot 2 f-11 or the UL-onlyslot 2 f-21, in which UL data can be transmitted.

Although a situation has been described above wherein UL data isscheduled only in one slot, the following schemes may be applied to acase wherein UL data is scheduled to be transmitted in multiple slots,or a case of semi-persistent scheduling.

-   -   According to the first scheme, the start OFDM symbol determined        from the slot format of the terminal-common control channel and        the end OFDM symbol of UL data received from the Y-bit field of        a terminal-specific control channel, which schedules the first        UL data are also applied to UL data transmission through        subsequent slots. Accordingly, the terminal transmits UL data by        applying the same UL data start OFDM symbol and the same end        OFDM symbol (or interval length) in multiple slots.    -   According to the second scheme, if the terminal-common control        channel informs of slot formats regarding subsequent channels,        start OFDM symbols determined from respective slot formats are        applied to subsequent slots, respectively, and the UL data end        OFDM symbol received from the Y-bit field of the        terminal-specific control channel, which schedules the first UL        data, is also applied to UL data transmission through subsequent        slots. Accordingly, the terminal transmits UL data by applying,        in multiple slots, start OFDM symbols that are different for        respective slots and the same UL data end OFDM symbol (or        interval length).

2) A method to be applied to a case wherein a terminal receives anupper-level signal configuration that instructs the terminal not todetect a terminal-common control channel, and thus does not detect aterminal-common control channel, will be described. OFDM symbols 2 f-12and 2 f-22, at which UL data starts, are estimated from theterminal-common control channel that indicates the slot format. The slotformat includes information regarding what format the slot has, thenumber of OFDM symbols of the DL interval, the number of OFDM symbols ofthe GP, and the number of OFDM symbols of the UL interval. For example,it is determined that, in the case of a UL-only slot having a ULinterval including 14 OFDM symbols, UL data is transmitted at the firstOFDM symbol. For example, it is determined that, in the case of aUL-centric slot having a DL interval including three OFDM symbols, a GPincluding one OFDM symbol, and a UL interval including ten OFDM symbols,UL data is transmitted at the fifth OFDM symbol. Accordingly, theterminal determines that UL data is transmitted from the first OFDMsymbol of the UL interval of the slot format indicated by theterminal-common control channel. The OFDM symbols (or interval length) 2f-13 and 2 f-23, at which the UL data ends, are indicated by aterminal-specific control channel that schedules UL data. The terminalreceives, from the Y-bit field of the terminal-specific control channel,information regarding the range of OFDM symbols of the UL-centric slot 2f-11 or the UL-only slot 2 f-21, in which UL data can be transmitted.

Although a situation has been described above wherein UL data isscheduled only in one slot, the following schemes may be applied to acase wherein UL data is scheduled to be transmitted in multiple slots,or a case of semi-persistent scheduling.

-   -   According to the first scheme, the start OFDM symbol determined        from the slot format of the terminal-common control channel and        the end OFDM symbol of UL data received from the Y-bit field of        a terminal-specific control channel, which schedules the first        UL data are also applied to UL data transmission through        subsequent slots. Accordingly, the terminal transmits UL data by        applying the same UL data start OFDM symbol and the same end        OFDM symbol (or interval length) in multiple slots.    -   According to the second scheme, if the terminal-common control        channel informs of slot formats regarding subsequent slots,        start OFDM symbols determined from respective slot formats are        applied to subsequent slots, respectively, and the UL data end        OFDM symbol received from the Y-bit field of the        terminal-specific control channel, which schedules the first UL        data, is also applied to UL data transmission through subsequent        slots. Accordingly, the terminal transmits UL data by applying,        in multiple slots, start OFDM symbols that are different for        respective slots and the same UL data end OFDM symbol (or        interval length).

FIG. 2G illustrates a base station procedure and a terminal procedureregarding the (2-2)^(th) embodiment of the disclosure.

Firstly, the base station procedure will be described.

In step 2 g-11, the base station transmits terminal-common controlchannel and terminal-specific control channel configuration informationto the terminal.

In step 2 g-12, the base station transmits a terminal-common controlchannel and a terminal-specific control channel to the terminal in viewof the slot format and UL data channel scheduling. The terminal-commoncontrol channel and a terminal-specific control channel includeinformation regarding the start OFDM symbol and end OFDM symbol (orinterval length) of the UL data channel as illustrated with reference toFIG. 2F.

Next, the terminal procedure will be described.

In step 2 g-21, the terminal receives terminal-common control channeland terminal-specific control channel configuration information from thebase station.

In step 2 g-22, the terminal receives a terminal-common control channeland a terminal-specific control channel from the base station anddetermines the start OFDM symbol and end OFDM symbol (or intervallength) of the UL data channel from the terminal-common control channeland the terminal-specific control channel. When a specific terminal isconfigured not to receive the terminal-common control channel, the samereceives only the terminal-specific control channel and determines thestart OFDM symbol and end OFDM symbol (or interval length) of the ULdata channel. The terminal-common control channel and theterminal-specific control channel include information regarding thestart OFDM symbol and end OFDM symbol (or interval length) of the ULdata channel as illustrated with reference to FIG. 2F.

The terminal-specific control channel described with reference to FIG.2D and FIG. 2F may schedule DL data by means of a one-bit flag, or mayschedule UL data. If the one-bit flag indicates 0, the terminal-specificcontrol channel schedules DL data; in this case, the X-bit field in aspecific position indicates the start OFDM symbol of the DL datachannel; and the terminal may receive the terminal-specific controlchannel and may determine the start OFDM symbol of the DL data channelfrom the X-bit field in the specific position. If the one-bit flagindicates 1, the terminal-specific control channel schedules UL data; inthis case, the Y-bit field in a specific position indicates the end OFDMsymbol (or interval length) of the UL data channel; and the terminal mayreceive the terminal-specific control channel and may determine the endOFDM symbol of the UL data channel from the Y-bit field in the specificposition. The terminal may determine that the X-bit field and the Y-bitfield have the same position and the same bit number, and may receivethe same accordingly.

Next, FIG. 2H illustrates a base station device according to thedisclosure.

The controller 2 h-01 controls UL/DL data transmission/receptionresources according to the base station procedure illustrated in FIG. 2Eand FIG. 2G of the disclosure and the method for transmitting/receivingUL/DL data illustrated in FIG. 2D and FIG. 2F of the disclosure,transmits the same to a terminal through a 5G control informationtransmission device 2 h-05, and schedules 5G data by a scheduler 2 h-03so as to transmit/receive 5G data to/from the 5G terminal through a 5Gdata transmission/reception device 2 h-07.

Next, FIG. 2i illustrates a terminal device according to the disclosure.

According to the terminal procedure illustrated in FIG. 2E and FIG. 2Gof the disclosure and the method for transmitting/receiving UL/DL dataillustrated in FIG. 2D and FIG. 2F of the disclosure, the same receivesa UL/DL data transmission/reception resource position from the basestation through a 5G control information reception device 2 i-05, andthe controller 2 i-01 transmits/receives 5G data, which has beenscheduled in the received resource position, to/from the 5G base stationthrough a 5G data transmission/reception device 2 i-06.

Third Embodiment

A wireless communication system has developed beyond the voice-basedservice provided at the initial stage into a broadband wirelesscommunication system that provides high-speed and high-quality packetdata services compliant with communication standards such as high-speedpacket access (HSPA) of 3GPP, long-term evolution (LTE) or evolveduniversal terrestrial radio access (E-UTRA), LTE-advanced (LTE-A),high-rate packet data (HRPD) of 3GPP2, ultra-mobile broadband (UMB), and802.16e of IEEE, and the like. Also, communication standards of 5G ornew radio (NR) are being developed as a 5G wireless communicationsystem.

In such a wireless communication system, including 5G, a terminal may beprovided with at least one service among enhanced mobile broadband(eMBB), massive machine-type communications (mMTC), and ultra-reliableand low-latency communications (URLLC). Such services may be provided tothe same terminal during the same time interval. In the embodiment, theeMBB may be a service aimed at high-speed transmission of large-capacitydata, the mMTC may be a service aimed at minimizing terminal power andconnecting multiple terminals, and the URLLC may be a service aimed athigh reliability and low latency, but the disclosure is not limitedthereto. The above three services may be major scenarios in a systemsuch as an LTE system or a post-LTE 5G/NR (new-radio or next-radio)system. In the embodiment, a method for coexistence between eMBB andURLLC or coexistence between mMTC and URLLC and a device using the samewill be described.

When a base station has scheduled, for a terminal, data corresponding toan eMBB service in a specific transmission time interval (TTI), and if asituation has occurred in which URLLC data needs to be transmitted inthe TTI, a part of eMBB data may not be transmitted in the frequencyband that has already been used to schedule and transmit the eMBB data,and the generated URLLC data may be transmitted in the frequency band.The terminal for which the eMBB has been scheduled and the terminal forwhich the URLLC has been scheduled may be the same terminal or differentterminals. In such a case, a part of the eMBB data that has already beenscheduled and transmitted may fail to be transmitted, and thepossibility that the eMBB data will be damaged accordingly increases.Therefore, there is a need to determine a method for processing a signalreceived by the terminal for which the eMBB has been scheduled or theterminal for which the URLLC has been scheduled in such a case, and amethod for receiving the signal. Accordingly, in the embodiment, amethod for coexistence between different kinds of services will bedescribed, wherein, when information regarding eMBB and informationregarding URLLC are scheduled by sharing all or part of a frequencyband, when information regarding mMTC and information regarding URLLCare scheduled simultaneously, when information regarding mMTC andinformation regarding eMBB are scheduled simultaneously, or wheninformation regarding eMBB, information regarding URLLC, and informationregarding mMTC are scheduled simultaneously, information regardingrespective services can be transmitted.

Hereinafter, embodiments of the disclosure will be described in detailwith reference to the accompanying drawings. In the followingdescription of the disclosure, a detailed description of known functionsor configurations incorporated herein will be omitted when it may makethe subject matter of the disclosure rather unclear. The terms whichwill be described below are terms defined in consideration of thefunctions in the disclosure, and may be different according to users,intentions of operators, or customs. Therefore, the definitions of theterms should be made based on the contents throughout the specification.As used herein, a base station refers to an entity that performsterminal resource allocation, and may be at least one of a gNode B, aneNode B, a Node B, a base station (BS), a wireless access unit, a basestation controller, a transmission and reception unit (TRP), or a nodeon a network. A terminal may include user equipment (UE), a mobilestation (MS), a cellular phone, a smartphone, a computer, or amultimedia system capable of performing a communication function. In thedisclosure, “downlink (DL)” refers to a path of wireless transmission ofa signal that a base station transmits to a terminal, and “uplink (UL)”refers to a path of wireless communication of a signal that a terminaltransmits to a base station. Although embodiments of the disclosure willbe described hereinafter with reference to an exemplary LTE or LTE-Asystem, embodiments of the disclosure are also applicable to othercommunication systems having similar technical backgrounds or channeltypes. For example, the 5th generation mobile communication technology(5G new radio (NR)) that is developed as post-LTE-A may belong thereto.In addition, embodiments of the disclosure may be applied to othercommunication systems through a partial modification that is not deemedby a person skilled in the art to substantially deviate from the scopeof the disclosure.

An LTE system, which is a representative example of the broadbandwireless communication system, employs an orthogonal frequency divisionmultiplexing (OFDM) scheme for a downlink (DL), and employs a singlecarrier frequency division multiple access (SC-FDMA) scheme for anuplink (UL). “Uplink” refers to a wireless link through which a terminal(or user equipment (UE) or a mobile station (MS)) transmits data or acontrol signal to a base station (BS) (or eNodeB), and “downlink” refersto a wireless link through which a base station transmits data or acontrol signal to a terminal. In the multiple access schemes describedabove, time-frequency resources for carrying data or control informationare allocated and operated in a manner that prevents overlapping of theresources, i.e. to establish orthogonality between users, so as toidentify data or control information of each user.

When decoding fails at the initial transmission, the LTE system employsa hybrid automatic repeat reQuest (HARQ) scheme that retransmits thecorresponding data in a physical layer. According to the HARQ scheme,when the receiver fails to accurately decode data, the receivertransmits information that indicates decoding failure (negativeacknowledgement (NACK)) to the transmitter such that the transmitter canretransmit the corresponding data in the physical layer. The receivercombines data retransmitted by the transmitter with data, the decodingof which has previously failed, thereby improving data receptionperformance. Also, when the receiver accurately decodes data, thereceiver may transmit information that indicates successful decoding(acknowledgement (ACK)) to the transmitter such that the transmitter cantransmit new data.

FIG. 3A illustrates the basic structure of a time-frequency domain,which is a radio resource domain where data or a control channel istransmitted in a downlink of an LTE system or a system similar thereto.

Referring to FIG. 3A, the horizontal axis indicates the time domain, andthe vertical axis indicates the frequency domain. The smallesttransmission unit in the time domain is an OFDM symbol, N_(symb) OFDMsymbols 3 a 02 constitute one slot 3 a 06, and two slots constitute onesubframe 3 a 05. The length of each slot is 0.5 ms, and the length ofeach subframe is 1.0 ms. The radio frame 3 a 14 is a time-domain unitincluding ten subframes. The smallest transmission unit in the frequencydomain is a subcarrier, and the bandwidth of the entire systemtransmission bandwidth includes a total of N_(BW) subcarriers 3 a 04.However, such specific numerical values may be applied variably.

In the time-frequency domain, the basic resource unit is a resourceelement (RE) 3 a 12, which may be expressed by an OFDM symbol index anda subcarrier index. A resource block (RB) (or physical resource block(PRB) 3 a 08 is defined by N_(symb) consecutive OFDM symbols 3 a 02 inthe time domain and N_(RB) consecutive subcarriers 3 a 10 in thefrequency domain. Therefore, one RB 3 a 08 in one slot may includeN_(symb)×N_(RB) REs 3 a 12. Generally, the minimum frequency-domainallocation unit of data is the RB unit, and in the LTE system,generally, N_(symb)=7 and N_(RB)=12, and N_(BW) and N_(RB) may beproportional to the bandwidth of the system transmission band. The datarate increases in proportion to the number of RBs that are scheduled forthe terminal. An LTE system may define and operate six transmissionbandwidths. In the case of an FDD system that separately operates thedownlink and the uplink on the basis of frequency, the downlinktransmission bandwidth and the uplink transmission bandwidth may differfrom each other. The channel bandwidth denotes an RF bandwidthcorresponding to the system transmission bandwidth. Table 3 providedbelow indicates a correlation between a system transmission bandwidthand a channel bandwidth defined in the LTE system. For example, in thecase of an LTE system having a channel bandwidth of 10 MHz, thetransmission bandwidth may include 50 RBs.

TABLE 3 Channel bandwidth 1.4 3 5 10 15 20 BW_(Channel) [MHz]Transmission bandwidth 6 15 25 50 75 100 configuration N_(RB)

Downlink control information may be transmitted within the initial NOFDM symbols inside the subframe. In the embodiment, generallyN={1,2,3}. Therefore, the value of N may be variably applied for eachsubframe according to the amount of control information to betransmitted in the current subframe. The transmitted control informationmay include a control channel transmission interval indicator indicatingthe number of OFDM symbols across which control information istransmitted, scheduling information associated with downlink data oruplink data, and a HARQ ACK/NACK signal.

In the LTE system, scheduling information associated with downlink dataor uplink data is transmitted from a base station to a terminal viadownlink control information (DCI). The DCI is defined according tovarious formats and may indicate, according to each format, whetherscheduling information regarding uplink data (UL grant) or schedulinginformation regarding downlink data (DL grant) is used, whether or not acompact DCI having a small control information size is used, whether ornot spatial multiplexing using multiple antennas is applied, and whetheror not a DCI for power control is used. For example, DCI format 1corresponding to scheduling control information regarding downlink data(DL grant) may include at least the following pieces of controlinformation.

-   -   Resource allocation type 0/1 flag: indicates whether the        resource allocation scheme is type 0 or type 1. Type 0 applies a        bitmap scheme and allocates resources in units of resource block        groups (RBGs). In the LTE system, the basic unit of scheduling        is an RB expressed by time and frequency domain resources, and        an RBG includes multiple RBs and is used as a basic unit of        scheduling in the type 0 scheme. Type 1 is used to allocate a        specific RB inside the RGB.    -   Resource block assignment: indicates RBs assigned to data        transmission. Expressed resources are determined according to        the system bandwidth and the resource allocation scheme.    -   Modulation and coding scheme (MCS): indicates the modulation        scheme used for data transmission and the size of the transport        block (TB), which is the data to be transmitted.    -   HARQ process number: indicates the process number of the HARQ.    -   New data indicator: indicates HARQ initial transmission or        retransmission.    -   Redundancy version: indicates the redundancy version of the        HARQ.    -   Transmit power control (TPC) command for physical uplink control        channel (PUCCH): indicates a transmit power control command        regarding a PUCCH, which is an uplink control channel.

The DCI may undergo channel coding and modulation processes and may betransmitted through a physical downlink control channel (PDCCH), whichis a downlink physical control channel (or control information, whichwill hereinafter be used interchangeably), or through an enhanced PDCCH(EPDCCH) (or enhanced control information, which will hereinafter beused interchangeably).

In general, the DCI is scrambled by a specific radio network temporaryidentifier (RNTI) (or terminal identifier) independently of eachterminal, a cyclic redundancy check (CRC) is added thereto, the DCI ischannel-coded, and the DCI is then configured as each independent PDCCHand transmitted. In the time domain, the PDCCH is mapped and transmittedduring the control channel transmission interval. The frequency domainmapping position of the PDCCH is determined by the identifier (ID) ofeach terminal, and may be distributed across the entire systemtransmission band and transmitted.

The downlink data may be transmitted through a physical downlink sharedchannel (PDSCH), which is a physical channel dedicated to downlink datatransmission. The PDSCH may be transmitted after the control channeltransmission interval, and scheduling information such as the specificmapping position in the frequency domain and the modulation scheme isdetermined on the basis of the DCI transmitted through the PDCCH.

By using an MCS among the control information constituting the DCI, thebase station notifies the terminal of the modulation scheme applied tothe PDSCH to be used for transmission and the size of the data to betransmitted (transport block size (TBS)). In an embodiment, the MCS mayinclude five bits, or more or fewer bits. The TBS corresponds to thesize before channel coding for error correction is applied to the data(transport block (TB)) to be transmitted by the base station.

The modulation scheme supported by the LTE system includes quadraturephase shift keying (QPSK), 16 quadrature amplitude modulation (QAM), and64QAM, and modulation orders (Q_(m)) thereof correspond to 2, 4, and 6respectively. That is, in the case of the QPSK modulation, 2 bits can betransmitted per symbol; in the case of the 16QAM modulation, 4 bits canbe transmitted per symbol; and in the case of 64QAM modulation, 6 bitscan be transmitted per symbol. It is also possible to use a modulationscheme of 256QAM or higher according to system modification.

FIG. 3B illustrates the basic structure of a time-frequency domain,which is a radio resource domain where data or a control channel istransmitted in an uplink of an LTE system.

Referring to FIG. 3B, the horizontal axis indicates the time domain, andthe vertical axis indicates the frequency domain. The smallesttransmission unit in the time domain is an SC-FDMA symbol 3 b 02, andN_(symbUL) SC-FDMA symbols may constitute one slot 3 b 06. Two slotsconstitute one subframe 3 b 05. The smallest transmission unit in thefrequency domain is a subcarrier, and the entire system transmissionbandwidth 3 b 04 includes a total of N_(BW) subcarriers. The N_(BW) mayhave a value proportional to the system transmission band.

In the time-frequency domain, the basic resource unit is a resourceelement (RE) 3 b 12, which may be expressed by an SC-FDMA symbol indexand a subcarrier index. A resource block pair (RB pair) 3 b 08 may bedefined by N_(symbUL) consecutive SC-FDMA symbols in the time domain andN_(scRB) consecutive subcarriers in the frequency domain. Therefore, oneRB includes N_(symbUL)×N_(scRB) REs. Generally, the minimum transmissionunit of data or control information is the RB unit. In the case ofPUCCH, the same is mapped to a frequency domain corresponding to one RBand transmitted during one subframe.

In an LTE system, there may be defined a timing relationship of a PUCCHor PUSCH which is an uplink physical channel for transferring an HARQACK/NACK, and which corresponds to a PDSCH that is a physical channelfor downlink data transmission or a PDCCH/EPDDCH that includessemi-persistent scheduling release (SPS release). For example, in an LTEsystem that operates according to frequency division duplex (FDD), anHARQ ACK/NACK corresponding to a PDSCH transmitted in the (n-4)^(t)subframe or a PDCCH/EPDCCH including SPS release may be transmittedthrough a PUCCH or PUSCH in the n^(th) subframe.

The downlink HARQ in an LTE system adopts an asynchronous HARQ type inwhich the data retransmission timepoint is not fixed. That is, when abase station has received a feedback of HARQ NACK from a terminal inresponse to initially transmitted data, the base station freelydetermines the retransmission data transmission timepoint by ascheduling operation. After buffering data that has been determined aserroneous as a result of decoding reception data for an HARQ operation,the terminal may perform combining with the next retransmission data.

If the terminal receives a PDSCH including downlink data transmittedfrom the base station in subframe n, the terminal transmits uplinkcontrol information including the HARQ ACK or NACK of the downlink datain subframe n+k to the base station through a PUCCH or PUSCH. In thiscase, k may be defined differently according to the FDD or time divisionduplex (TDD) of the system of LTE and the subframe configurationthereof. For example, in the case of an FDD LTE system, k is fixed to 4.In the case of a TDD LTE system, k may vary according to the subframeconfiguration and the subframe number. In addition, when data istransmitted through multiple carriers, the value of k may be differentlyapplied according to the TDD configuration of each carrier.

In an LTE system, uplink HARQ adopts a synchronous HARQ type in whichthe data transmission timepoint is fixed, unlike downlink HARQ. That is,the up/downlink timing relationship of a physical uplink shared channel(PUSCH) which is a physical channel for uplink data transmission, aPDCCH which is a downlink control channel preceding the same, and aphysical hybrid indicator channel (PHICH) which is a physical channelfor transmitting a downlink HARQ ACK/NACK, and which corresponds to thePUSCH, may be transmitted/received according to the following rule.

If the terminal receives a PDCCH including uplink scheduling controlinformation transmitted from the base station in subframe n or a PHICHfor transmitting a downlink HARQ ACK/NACK, the terminal transmits uplinkdata corresponding to the control information in subframe n+k through aPUSCH. In this case, k may be defined differently according to the FDDor time division duplex (TDD) of the system of LTE and the subframeconfiguration thereof. For example, in the case of an FDD LTE system, kmay be fixed to 4. In the case of a TDD LTE system, k may vary accordingto the subframe configuration and the subframe number. In addition, whendata is transmitted through multiple carriers, the value of k may bedifferently applied according to the TDD configuration of each carrier.

In addition, if the terminal receives a PHICH including informationregarding a downlink HARQ ACK/NACK from the base station in subframe i,the PHICH corresponds to the PUSCH transmitted by the terminal insubframe i-k. In this case, k may be defined differently according tothe FDD or TDD of the system of LTE and the configuration thereof. Forexample, in the case of an FDD LTE system, k is fixed to 4. In the caseof a TDD LTE system, k may vary according to the subframe configurationand the subframe number. In addition, when data is transmitted throughmultiple carriers, the value of k may be differently applied accordingto the TDD configuration of each carrier.

TABLE 4 Transmission Transmission scheme of PDSCH mode DCI format SearchSpace corresponding to PDCCH Mode 1 DCI format Common and Single-antennaport, port 0 (see 1A UE specific by C-RNTI subclause 7.1.1) DCI format 1UE specific by C-RNTI Single-antenna port, port 0 (see subclause 7.1.1)Mode 2 DCI format Common and Transmit diversity (see subclause 7.1.2) 1AUE specific by C-RNTI DCI format 1 UE specific by C-RNTI Transmitdiversity (see subclause 7.1.2) Mode 3 DCI format Common and Transmitdiversity (see subclause 7.1.2) 1A UE specific by C-RNTI DCI format UEspecific by C-RNTI Large delay CDD (see subclause 7.1.3) or 2A Transmitdiversity (see subclause 7.1.2) Mode 4 DCI format Common and Transmitdiversity (see subclause (7.1.2) 1A UE specific by C-RNTI DCI format 2UE specific by C-RNTI Closed-loop spatial multiplexing (see subclause7.1.4)or Transmit diversity (see subclause 7.1.2) Mode 5 DCI formatCommon and Transmit diversity (see subclause 7.1.2) 1A UE specific byC-RNTI DCI format UE specific by C-RNTI Multi-user MIMO (see subclause7.1.5) 1D Mode 6 DCI format Common and Transmit diversity (see subclause7.1.2) 1A UE specific by C-RNTI DCI format UE specific by C-RNTIClosed-loop spatial multiplexing (see 1B subclause 7.1.4) using a singletransmission layer Mode 7 DCI format Common and If the number of PBCHantenna ports is one, 1A UE specific by C-RNTI Single antenna port, port0 is used (see subclause 7.1.1), otherwise Transmit diversity (seesubclause 7.1.2) DCI format 1 UE specific by C-RNTI Single-antenna port,port 5 (see subclause 7.1.1) Mode 8 DCI format Common and If the numberof PBCH antenna ports is one, 1A UE specific by C-RNTI Single-antennaport, port 0 is used (see subclause 7.1.1), otherwise Transmit diversity(see subclause 7.1.2) DCI format UE specific by C-RNTI Dual layertransmission, port 7 and 8 (see 2B subclause 7.1.5A) or single-antennaport, port 7 or 8 (see subclause 7.1.1)

Table 4 above enumerates DCI format types that can be supportedaccording to respective transmission modes under conditions configuredby C-RNTI that follows 3GPP TS 36.213 (PDCCH and PDSCH configured byC-RNTI). The terminal assumes that the corresponding DCI format existsin a control space interval according to a preconfigured transmissionmode, and then performs searching and decoding. For example, iftransmission mode 8 is indicated to the terminal, the terminal searchesfor DCI format 1A in the common search space and the UE-specific searchspace, and searches for DCI format 2B only in the UE-specific searchspace.

The above description of a wireless communication system has been madewith reference to an LTE system, and the content of the disclosure isnot limited to the LTE system, and is also applicable to variouswireless communication systems such as NR and 5G. In addition, whenapplied to a different wireless communication system in an embodiment,the value of k may be changed and applied also to a system using amodulation type corresponding to FDD.

FIG. 3C and FIG. 3D illustrate allocation of pieces of data for eMBB,URLLC, and mMTC, which are services considered in a 5G or NR system, inconnection with a frequency-time resource.

Referring to FIG. 3C and FIG. 3D, types of allocation of frequency andtime resources for information transmission in respective systems areillustrated.

Firstly, FIG. 3C illustrates allocation of data for eMBB, URLLC, andMMTC in the entire system frequency band 3 c 00. If URLLC data 3 c 03, 3c 05, and 3 c 07 is generated and needs to be transmitted while eMBB 3 c01 and mMTC 3 c 09 are allocated and transmitted in a specific frequencyband, the URLLC data 3 c 03, 3 c 05, and 3 c 07 may be transmitted afteremptying the parts to which eMBB 3 c 01 and mMTC 3 c 09 have alreadybeen allocated or without transmitting the same. Since the URLLC amongthe services needs to have reduced latency, the URLLC data 3 c 03, 3 c005, and 3 c 07 may be allocated to a part of the resource 3 c 01 towhich eMBB has been allocated, and then transmitted. Obviously, if URLLCis additionally allocated to the resource to which eMBB has beenallocated and then transmitted, eMBB data may not be transmitted in theoverlapping frequency-time resource, and the eMBB data transmissionperformance may degrade accordingly. That is, in the above case, URLLCallocation may result in eMBB data transmission failure.

In FIG. 3D, the entire system frequency band 3 d 00 may be divided andused to transmit services and data in respective sub-bands 3 d 02, 3 d04, and 3 d 06. Information regarding the sub-band configuration may bedetermined in advance, and the information may be transmitted from thebase station to the terminal through upper-level signaling.Alternatively, in connection with information regarding the sub-bands,the base station or network node may arbitrarily divide and provideservices to the terminal without transmitting any separate sub-bandconfiguration information. In FIG. 3D, the sub-band 3 d 02 is used totransmit eMBB data, the sub-band 3 d 04 is used to transmit URLLC data,and the sub-band 3 d 06 is used to transmit mMTC.

The length of the transmission time interval (TTI) used for URLLCtransmission throughout the entire embodiment may be smaller than thelength of the TTI used to transmit eMBB or mMTC. In addition, a responseto information regarding URLLC may be transmitted faster than in thecase of eMBB or mMTC, and information can accordingly betransmitted/received with low latency.

The eMBB service described hereinafter will be referred to as afirst-type service, and data for eMBB will be referred to as first-typedata. The first-type service or first-type data is not limited to eMBB,and may also correspond to a case in which high-speed data transmissionis required, or wideband transmission is conducted. In addition, a URLLCservice will be referred to as a second-type service, and data for URLLCwill be referred to as second-type data. The second-type service orsecond-type data is not limited to URLLC, and may also correspond to acase in which low latency is required or high-reliability transmissionis required, or to a different system in which low latency and highreliability are both required. In addition, the mMTC service will bereferred to as a third-type service, and data for mMTC will be referredto as third-type data. The third-type service or third-type data is notlimited to mMTC, and may also correspond to a case in which a low speed,wide coverage, or low power is required. In addition, in the descriptionof an embodiment, the first service may be understood as including thethird type service or not including the same.

Physical layer channels used for respective types to transmit the threekinds of services or data may have different structures. For example, atleast one of the length of the TTI, the frequency resource allocationunit, the control channel structure, and the data mapping method maydiffer.

Although three kinds of services and three kinds of data have beendescribed above, more kinds of services and data corresponding theretomay exist, and the content of the disclosure is also applicable to suchcases.

The terms “physical channels” and “signals” in a conventional LTE orLTE-A system may be used to describe a method and a device proposed inan embodiment. However, the content of the disclosure is also applicableto a wireless communication system other than LTE and LTE-A systems.

An embodiment defines, as described above, transmission/receptionoperations of a terminal and a base station for transmitting first-,second-, and third-type services or data, and proposes a detailed methodfor operating terminals that receive different types of services or datascheduling together in the same system. As used herein, “first-,second-, and third-type terminals” refer to terminals that receivefirst-, second-, and third-types of services or data scheduling,respectively. In an embodiment, the first-, second-, and third-typeterminals may be the same terminal or different terminals.

In the following embodiment, at least one of the uplink scheduling grantsignal and the downlink data signal will be referred to as a firstsignal. In addition, at least one of the uplink data signal regardingthe uplink scheduling grant and the HARQ ACK/NACK regarding the downlinkdata signal will hereinafter be referred to as a second signal in thedisclosure. In an embodiment, among signals transmitted from the basestation to the terminal, a signal that expects a response from theterminal may be the first signal, and a response signal of the terminalcorresponding to the first signal may be the second signal. In anembodiment, furthermore, the service type of the first signal may be atleast one of eMBB, URLLC, and mMTC, and the second signal may alsocorrespond to at least one of the services.

In the following embodiment, the TTI length of the first signal mayindicate the length of time for which the first signal is transmitted,as a time value related to first signal transmission. In addition, inthe disclosure, the TTI length of the second signal may indicate thelength of time for which the second signal is transmitted, as a timevalue related to second signal transmission, and the TTI length of thethird signal may indicate the length of time for which the third signalis transmitted, as a time value related to third signal transmission.Furthermore, in the disclosure, second signal transmission timingcorresponds to information regarding when the terminal transmits thesecond signal and when the base station receives the second signal, andmay be referred to as second signal transmission/reception timing.

The content in the disclosure is applicable in FDD and TDD systems.

As used herein, upper-level signaling is a signal transfer methodwherein the base station transfers a signal to the terminal by using thedownlink data channel of the physical layer, or the terminal transfers asignal to the base station by using the uplink data channel of thephysical layer, and may also be referred to as RRC signaling, PDCPsignaling, or MAC control element (MAC CE).

The content in the disclosure is applicable in FDD and TDD systems.

FIG. 3E illustrates control and data information transfer.

FIG. 3EA and FIG. 3EB illustrate situations wherein a transport block(TB) of the first service type is transmitted through the downlink inthe N^(th) transport interval 3 e 06 and in the (N+1)^(th) transportinterval 3 e 14, respectively. The N^(th) transport interval 3 e 06includes a control area 3 e 02 and a data area 3 a 16, and the controlarea 3 e 02 provides the terminal, in advance, with all or part ofinformation regarding the modulation and coding scheme (MCS) of thetransport block of the first service type, the hybrid ARQ (HARQ) processnumber, resource block (RB) allocation, and the start position (symbolor slot or mini-slot) and the end position (symbol or slot or semi-slot)of the corresponding data area 3 e 16. In the N^(th) transport interval3 e 06, the control area 3 e 02 and the data area 3 e 16 may have thesame frequency resource, different frequency resources, or partiallyidentical frequency resource, depending on the case. The case in which Nis 1 corresponds to a situation in which the transport block of thefirst service type is initially transmitted, and the case in which N islarger than 2 indicates a situation in which the transport block of thefirst service type is retransmitted. The (N+1)^(th) transport interval 3e 14 indicates a situation wherein the transport block of the firstservice type, which has been transmitted in the N^(th) transportinterval 3 e 06, is transmitted again. Such a situation ofretransmission may correspond to a case wherein the transport block ofthe first service type, which has been transferred to the base stationfrom the terminal in the N^(th) transport interval 3 e 06, fails to bereceived. The (N+1)^(th) transport interval 3 e 14 includes a controlarea 3 e 10 and a data area 3 e 12. The transport block of the firstservice type is positioned in the data area 3 e 04 in the N^(th)transport interval 3 e 06 and in the data area 3 e 12 in the (N+1)^(th)transport interval 3 e 14, respectively. There may be a situationwherein a transport block of a second service type, which is differentfrom the first service type, occurs in the N^(th) transport interval 3 e06, and a part of the data area 3 e 04, to which a previously scheduledtransport block of the first service type has been allocated, is usedfor a transport block of the second service type. Accordingly, thetransport block of the first service type, which has been allocated tothe data area 3 e 04 of the N^(th) transport interval 3 e 04, may bepartially broken by the resource area 3 e 16 used for the transportblock of the second service type. That is, when the terminal receivesthe transport block of the first service type, decoding of code blocks(CBs) constituting the corresponding transport block may partially fail.

The first service type may be eMBB or mMTC, for example, and the secondservice type may be URLLC. When the terminal fails to decode some of thecode blocks constituting the transport block of the first service type,the terminal reports to the base station that decoding of the transportblock including the corresponding code blocks has failed. In the(N+1)^(th) transport interval 3 e 14, the transport block of the firstservice type, which has failed to be transmitted in the N^(th) transportinterval 3 e 06, is transmitted again. In addition, informationregarding whether the data area 3 e 12 of the (N+1)^(th) transportinterval 3 e 14 is a retransmitted transport block or a new transportblock in the control area 3 e 10 of the (N+1)^(th) transport interval 3e 14 is included in the DCI of the control area 3 e 10 and transferredto the terminal. In LTE, bit information referred to as a new dataindicator (NDI) provides information thereon. If the terminal confirmsretransmission with reference to the NDI, the pre-decoding value (or rawdata) of the transport block received in the previous transport intervaland the pre-decoding value (or raw data) of the transport block receivedin the current transport interval are HARQ-combined, thereby performingdecoding. This is for the purpose of increasing the probability ofsuccessful decoding. However, the HARQ combining is not to be performedin a situation wherein the transport block of the second service typeoccupies a part of the data area which has already been allocated forthe transport block of the first service type. This is because some orall of several arbitrary code blocks of the transport block of the firstservice type could be interpreted as being replaced by a transport blockof the second service type. Accordingly, if the terminal conducts theHARQ combining after determining that the (N+1)^(th) transmission isretransmission of the N^(th) transmission, code blocks having differentpieces of information may end up being combined. Therefore, in such asituation, decoding is preferably performed only by the same code blockstransmitted in the (N+1)^(th) transport interval without HARQ-combiningcode blocks constituting the transport block of the first service type,which have been damaged by the transport block of the second servicetype. For example, if the i^(th) code block of the transport block ofthe first service type in the N^(th) transport interval is damaged bythe transport block of the second service type, the i^(th) code blockretransmitted in the (N+1)^(th) transport interval is solely decodedwithout HARQ-combining the i^(th) code block of the transport block ofthe first service type, which has been transmitted again in the(N+1)^(th) transport interval, with the i^(th) code block that has beendamaged in the N^(th) transport interval. Accordingly, the DCI needs toinclude information for additionally determining whether or not toperform HARQ combining.

In the disclosure, such information is referred to as a second servicetype occurrence indicator (or HARQ-combining indicator). For example, ifthe HARQ-combining indicator in the DCI that indicates retransmission is0, the terminal considers that combining of the transport block of theprevious transport interval and the transport block of the currenttransport interval is not to be performed. In contrast, if theHARQ-combining indicator in the DCI that indicates retransmission is 1,the terminal considers that combining of the transport block of theprevious transport interval and the transport block of the currenttransport interval is not to be performed. It is to be noted that thevalue of the HARQ-combining indicator in this example can be appliedinterchangeably. The HARQ-combining indicator may be one-bit informationas in the above example, and may also be information including morebits. One-bit information alone may be sufficient to indicate whether ornot HARQ combining is to be performed. The corresponding HARQ-combiningindicator may always be included in the DCI that is transmitted throughthe control area across the entire system frequency band, or may beincluded only in the DCI that is transmitted in the frequency band inwhich the second service type can be transmitted. In addition, only basestations capable of supporting the second service type can transmit aDCI including the corresponding HARQ-combining indicator.

The above-mentioned HARQ-combining indicator may have information, towhich one bit is separately added, in the DCI. As another example, sincethe HARQ-combining indicator corresponds to an operation applied if theinformation indicated by the NDI indicates retransmission, the DCIconstituent elements may be interpreted differently according to thevalue indicated by the NDI without adding a separate bit for theHARQ-combining indicator. That is, if the NDI indicates retransmission,some of various elements constituting the DCI of LTE, such as the HARQprocess number, MCS or RB allocation, and RV, may be utilized as theHARQ-combining indicator. When the NDI indicates retransmission, the MCSis capable of an operation of selecting one from 29-31 as the I_(MCS)value as given in Table 5 below. Table 5 (Modulation and TBS index tablefor PDSCH) given below is based on Table 7.1.7.1-1 included in document3GPP TS 36.213-d20.

The TBS size follows the TBS size determined in the previoustransmission, and only the modulation order can be changed. When the NDIindicates retransmission, it is possible to utilize only three values,as the MCS value, among 32 cases provided by using a total of five bitsin LTE. Accordingly, in post-LTE 5G (NR), next-generation mobilecommunication, if the NDI indicates retransmission, one bit among thetotal bit number constituting the MCS may be utilized as theHARQ-combining indicator. In the case of LTE, for example, if the NDIindicates retransmission while a total of five bits is used for the MCS,one bit among the total of five bits constituting the MCS may be used asa bit indicating the HARQ-combining indicator, and the remaining fourbits may be utilized to indicate an MCS newly configured in aretransmission situation. If the TBS follows the previous transmissionvalue in the retransmission situation, and if the modulation order issolely changed, only the total number of modulation orders that can besupported in the corresponding system is necessary. If a total of threemodulation orders is solely supported in the LTE, retransmission DCI canbe supported sufficiently solely by the remaining four bits other thanone bit excluded for the HARQ-combining indicator.

TABLE 5 MCS Index Modulation Order Modulation Order TBS Index I_(MCS)Q_(m) Q_(m) I_(TBS) 0 2 2 0 1 2 2 1 2 2 2 2 3 2 2 3 4 2 2 4 5 2 4 5 6 24 6 7 2 4 7 8 2 4 8 9 2 4 9 10 4 6 9 11 4 6 10 12 4 6 11 13 4 6 12 14 46 13 15 4 6 14 16 4 6 15 17 6 6 15 18 6 6 16 19 6 6 17 20 6 6 18 21 6 619 22 6 6 20 23 6 6 21 24 6 6 22 25 6 6 23 26 6 6 24 27 6 6 25 28 6 626/26A 29 2 2 reserved 30 4 4 31 6 6

A schematic diagram of the above-described example is as follows. Thatis, in the Table 6 below, the NDI shows the initial transmission in (A),and (B) shows a retransmission situation. When the NDI indicatesretransmission, the MCS of Y bits used in the initial transmission(specifically, area indicating Modulation and TBS index Tableinformation) is divided into a HARQ-combining indicator of Z bits and anewly configured MCS of Z′ bits. It is to be noted that Y=Z+Z′. In LTE,X=1, Y=5. In addition, although Z=1 is considered as the bit number ofthe HARQ-combining indicator in the disclosure, other values can also beconsidered. The MCS expressed in the following diagram may be utilizedsufficiently as information constituting a different DCI.

As another example, it is also possible to utilize one-bit configurationamong information allocated to MCS, HARQ process, and RB allocation asthe HARQ-combining indicator. That is, it is possible to configure atotal of five bits for the MCS and to use a total of 32 cases, and ifnot all of the 32 cases but only some thereof are used, the cases thatare not used may be used for the HARQ-combining indicator. That is, itmay be interpreted that, if a bit configuration configured as 11010 isnot used as MCS information, the corresponding information indicates theHARQ-combining indicator. The above example is sufficiently applicablein the same manner to another constituent element of different DCIinformation.

The disclosure proposes a method for minimizing the influence of aservice of a second service type on a terminal that supports a firstservice type. The above-described code blocks may all be interpreted asa unit constituting a transport block of the first service type. Theabove-described HARQ-combining indicator may also be used as a term of asecond service type occurrence indicator, an HARQ indicator, or acombining indicator. In addition, the HARQ-combining indicator may beadded to a specific format or all of formats of a DCI positioned in adownlink control area and utilized accordingly. The HARQ-combiningindicator may exit in such a manner that one bit is added to an existingDCI field, or may be configured such that the same is added to MCS, HARQprocess, and RB allocation among elements constituting the existing DCI.For example, some of bits constituting the MCS may be utilized as theHARQ-combining indicator. The DCI including the HARQ-combining indicatormay exist in the entire frequency band supported by the terminal or inonly a part of the frequency band. Alternatively, the base station mayprovide a DCI configuration including the HARQ-combining indicator toall terminals or to each terminal by means of high-layer signaling suchas MAC CE, SIB, or RRC. Instead of being included in the DCI as explicitbit information, the HARQ-combining indicator may be transferred to agroup of terminals or to each terminal semi-statically in the form ofMAC CE, SIB, or RRC. Accordingly, if the HARQ-combining indicator isreceived semi-statically, the retransmitted transport block may operatein such a manner that HARQ combining is always performed or is notperformed during a predetermined interval.

Moreover, the HARQ-combining indicator may be supported implicitly. Thatis, if a specific value is indicated by a combination or individualstates of elements constituting a specific MCS, specific HARQ process,RB allocation, or another DCI field, the terminal may interpret the sameas an operation of performing or not performing HARQ combining. Forexample, if specific values among values constituting the MCS aredenoted, or if specific bits among all bits constituting the MCSindicate a specific value, the terminal may interpret the same as anoperation of performing or not performing HARQ combining. Alternatively,according to the position or range of the frequency or time of aresource from which a DCI field has been detected, the terminal mayinterpret the same as an operation of performing or not performing HARQcombining. Alternatively, according to the position or range of thefrequency or time of a data area resource allocated to a transportinterval before a retransmission DCI is received, the terminal mayinterpret the same as an operation of performing or not performing HARQcombining. Alternatively, according to the number of code blocksconstituting a transport block, the terminal may interpret the same asan operation of performing or not performing HARQ combining.Alternatively, according to the number of all code blocks constituting atransport block and the index, order, or position of a code block, thedecoding of which has failed (or succeeded) in the previoustransmission, the terminal may interpret the same as an operation ofperforming or not performing HARQ combining. In addition, according tothe number/degree of code blocks, the decoding of which has succeeded(or failed) in the previous transmission, among the total number of codeblocks constituting a transport block, the terminal may interpret thesame as an operation of performing or not performing HARQ combining. Inaddition, according to the HARQ timing value, the terminal may interpretthe same as an operation of performing or not performing HARQ combining.The HARQ timing may be defined as the time between downlink resourceallocation and downlink data transmission, the time between downlinkdata transmission result reporting and downlink data retransmission, orthe time between downlink data transmission and transmission resultreporting. In addition, according to the number of configured HARQprocesses, the terminal may interpret the same as an operation ofperforming or not performing HARQ combining. In addition, according tothe terminal type, the terminal may interpret the same as an operationof performing or not performing HARQ combining Examples of the terminaltype includes a terminal supporting both the first service type and thesecond service type and a terminal supporting only a part thereof. Inaddition, according to channel estimation values that the terminal hasreported to the base station, such as channel state information (CSI),precoding matrix indicator (PMI), or reference signal received power(RSRP), the terminal may interpret the same as an operation ofperforming or not performing HARQ combining.

FIG. 3F is a block diagram illustrating a method for receiving data by aterminal according to the (3-1)^(th) embodiment.

FIG. 3F illustrates a terminal operation when a second service typeoccurrence indicator (or HARQ-combining indicator) exists in a DCIexisting in a control area. The terminal initially checks the controlarea before checking the data area, and then checks (3 f 00) theHARQ-combining indicator included in the DCI of the control area. If thesecond service type occurrence indicator indicates YES (for example,one-bit value of 0), the same means that occurrence of the secondservice type is indicated, and the terminal operates assuming that HARQcombining is not performed. Accordingly, code blocks included in thetransport block received in the current transport interval are solelydecoded (3 f 04). In contrast, if the second service type occurrenceindicator indicates NO (for example, one-bit value of 1), the same meansthat non-occurrence of the second service type is indicated, and theterminal operates (3 f 02) assuming that HARQ combining is performed.Therefore, code blocks received in the current transport interval areHARQ-combined with code blocks received in the previous transmission andthen decoded (3 f 02). The above example of YES or NO has a one-bitvalue of 0 or 1, and the interpretation still holds when the same areswitched. It is to be noted that the example of YES or NO could also bedetermined by the terminal implicitly. The above-described code blocksmay all be interpreted as a unit constituting a transport block of thefirst service type.

FIG. 3G is a block diagram illustrating a method for receiving data by aterminal according to the (3-2)^(th) embodiment.

FIG. 3G illustrates a terminal operation (3 g 00) when an NDI and asecond service type occurrence indicator (or HARQ-combining indicator)exist in a DCI existing in a control area. The terminal checks (3 g 02)the NDI in the control area and, if initial transmission is confirmed asa result of checking, the terminal immediately decodes the correspondingcode block (3 g 04). If retransmission is confirmed as a result ofchecking (3 g 02) the NDI, the terminal checks (3 g 06) theHARQ-combining indicator. If the second service type occurrenceindicator indicates YES (for example, one-bit value of 0), the samemeans that occurrence of the second service type is indicated, and theterminal operates assuming that HARQ combining is not performed.Accordingly, code blocks included in the transport block received in thecurrent transport interval are solely decoded (3 g 10). In contrast, ifthe second service type occurrence indicator indicates NO (for example,one-bit value of 1), the same means that non-occurrence of the secondservice type is indicated, and the terminal operates (3 g 08) assumingthat HARQ combining is performed. Therefore, code blocks received in thecurrent transport interval are HARQ-combined with code blocks receivedin the previous transmission and then decoded (3 g 08). The aboveexample of YES or NO has a one-bit value of 0 or 1, and theinterpretation still holds when the same are switched. It is to be notedthat the example of YES or NO could also be determined by the terminalimplicitly. The above-described code blocks may all be interpreted as aunit constituting a transport block of the first service type.

FIG. 3H illustrates a process of receiving data by a terminal accordingto the (3-3)^(th) embodiment.

FIG. 3H illustrates a process of the terminal receiving data of thefirst service type from the viewpoint of code blocks. FIG. 3Hillustrates a situation wherein a total of six code blocks exist. Theremay occur a situation wherein, while decoding successively proceeds (3 h00) from code block (CB) 1 in the N^(th) transport interval, decoding ofcode block 3 fails. Such a case of failed decoding may include a casewherein the corresponding code block is damaged (3 h 04) by influence ofthe channel or by the second service type. The following code blocks 4-6may not be decoded (3 h 02), and the pre-decoding value may be stored inthe buffer of the corresponding terminal. A situation supporting such anoperation may be applied to reduce power consumption of the terminalthat may additionally occur depending on decoding of the terminal Thatis, since the result of decoding the corresponding transport block whilecode block 3 has been damaged is failure, the probability of successfuldecoding is increased by performing HARQ combining with the code blockretransmitted later and then performing decoding with regard to eachcode block, and no decoding is accordingly performed after code block 3.That is, in connection with all code blocks 4-6 following code block 3,the pre-decoding value is stored in the buffer, and the value aftersuccessful decoding, in connection with code blocks 1 and 2, is storedin the buffer. The terminal performs (3 h 06), after confirming withreference to the HARQ-combining indicator whether or not to conduct HARQcombining (3 h 08) of code blocks 3-6 received in the (N+1)^(th)transport interval and code blocks 3-6 received in the N^(th) transportinterval. That is, if the HARQ-combining indicator indicates HARQcombining, code blocks 3-6 successively undergo HARQ combining and thendecoding. In contrast, if the HARQ-combining indicator indicates no HARQcombining, only code blocks 3-6 received in the (N+1)^(th) transportinterval, among code blocks 3-6, are decoded. In addition, an operationof erasing the pre-decoding values of code blocks 3-6 received in theprevious N^(th) transport interval from the buffer is also applied. Theabove-described code blocks may all interpreted as a unit constituting atransport block of the first service type. The situation presented inthe embodiment, that is, the situation wherein one transport blockincludes six code blocks, is applicable through the same operation evenwhen the number of code blocks is any natural number value other thansix.

FIG. 31A and FIG. 31B are block diagrams illustrating a process ofreceiving data by a terminal according to the (3-3)^(th) embodiment.

The terminal initially configures the K^(th) code block value as n (3 i00). The value of n has the value of 1 during initial transmission. Theterminal then checks (3 i 02) the second service type occurrenceindicator (or HARQ-combining indicator). If the result of checking theindicator indicates YES (that is, second service type occurred and HARQcombining not performed), the terminal decodes (3 i 06) only the K^(th)code block in the current transport interval. In contrast, if the resultof checking the indicator indicates NO (that is, the second service typenot occurred and HARQ combining performed), the terminal HARQ-combinesthe K^(th) code block in the current transport interval and the K^(th)code block, the decoding of which has failed in the previous transportinterval, and then performs decoding (3 iO4). The terminal then checksthe result of performing decoding (3 i 08). If the decoding result issuccessful after performing each decoding, it is checked (3 i 14)whether the corresponding K^(th) code block is the last code block ofall code blocks constituting the transport block. If K indicates thelast code block, the terminal informs (3 i 18) the base station that thetransport block transmitted from the base station according to thecorresponding preconfigured ACK/NACK report timing is successful. If theK^(th) code block is not the last code block, the terminal performs (3 i12) the same process with regard to the (K+1)^(th) code block as hasbeen performed with regard to the K^(th) code block. If decoding of theK^(th) code block fails, the terminal stores (3 i 10) the pre-decodingvalue of all code blocks, the decoding of which has not been attempted,following the K^(th) code block in the buffer of the terminal, andupdates (3 i 16) the value of n to K. This means that, in the case ofretransmission conducted next, the terminal attempts decoding from thecorresponding updated n^(th) code block. The terminal then informs thebase station that decoding of the corresponding transport block hasfailed (3 i 20). The above-described code blocks may all be interpretedas a unit constituting a transport block of the first service type.

FIG. 3J illustrates a process of receiving data by a terminal accordingto the (3-4)^(th) embodiment.

FIG. 3J illustrates a situation wherein the terminal receives atransport block including a total of six code blocks in the N^(th)transport interval, and successively decodes respective code blocks.Unlike the third embodiment, the terminal decodes all regardless ofwhether decoding of each code block is a failure or a success (3 j 00).The (3-4)^(th) embodiment shows that decoding of code blocks 3 and 5 hasfailed as a result. The reason for the corresponding decoding failuremay be the influence of the channel change or because the transportblock of the second service type has occupied a part of the data areaconfigured for the transport block of the first service type. Theterminal reports to the base station that the partially failed codeblock decoding has led to failed decoding of the corresponding transportblock, and the base station later transmits the corresponding transportblock to the terminal again in the (N+1)^(th) transport interval. Theterminal omits additional decoding of the code blocks, the decoding ofwhich has succeeded, and re-attempts to decode only the code blocks thathave not been successfully decoded (3 j 02 and 3 j 04). According to thesecond service type occurrence indicator (or HARQ-combining indicator),it is determined (3 j 06 and 3 j 08) whether to combine and decode thethird code blocks and the fifth code blocks in the N^(th) transportblock and the (N+1)^(th) transport block or to decode only the thirdcode block and the fifth code block received in the (N+1)^(th) transportblock. The terminal performs decoding according to the operationdetermined by the indicator, and reports the corresponding decodingresult to the base station. The above-described code blocks may allinterpreted as a unit constituting a transport block of the firstservice type. The situation presented in the embodiment, that is, thesituation wherein one transport block includes six code blocks, isapplicable through the same operation even when the number of codeblocks is any natural number value other than six.

FIG. 3KA and FIG. 3KB are block diagrams illustrating a process ofreceiving data by a terminal according to the (3-4)^(th) embodiment.

The terminal initially configures K=1 (3 k 00). That is, the operationstarts from the first code block among code blocks constituting thetransport block of the first service type. It is determined whether ornot decoding of the K^(th) code block has succeeded in the previoustransport interval (3 k 02). In the case of success, the terminal checks(3 k 08) whether or not the K^(th) code block is the last code block. Inthe case of the last code block, the terminal determines whether or notdecoding of all code blocks has succeeded (3 k 10). If decoding of allcode block has succeeded, the terminal informs the base station thatdecoding of the corresponding transport block has succeeded (3 k 16). Ifdecoding of all code blocks has not succeeded, the terminal informs thebase station that decoding of the corresponding transport block hasfailed (3 k 18). If the K^(th) code block is not the last code block,the terminal performs (3 k 04) the same operation with regard to the(K+1)^(th) code block as in the method performed with regard to theK^(th) code block. If decoding of the K^(th) code block has failed inthe previous transport interval, the terminal checks (3 k 06) the secondservice type occurrence indicator (or HARQ-combining indicator). If itis confirmed as a result of checking that the second service type hasoccurred (or HARQ combining has not been indicated), the terminaldecodes only the K^(th) code block in the current transport interval (3k 14). If the second service type has not occurred (or if HARQ combininghas been indicated), the K^(th) code block, the decoding of which hasfailed in the previous transport interval, and the K^(th) code block inthe current transport interval are HARQ-combined and then decoded (3 k12). After performing respective decoding processes, the terminal checksthe result of successful K^(th) decoding (3 k 22). If the decoding hassucceeded, the terminal checks whether or not the corresponding codeblock is the last code block (3 k 26). In the case of the last codeblock, the terminal determines whether or not decoding of all codeblocks has succeeded (3 k 28). If decoding of all code blocks succeeds,the terminal determines that the decoding of the corresponding transportblock has succeeded, and reports the same to the base station (3 k 30).If decoding of some code blocks fails, the terminal determines thatdecoding of the corresponding transport block has failed, and reportsthe same to the base station (3 k 32). If the K^(th) code block is notthe last code block, processes performed with regard to the K^(th) codeblock are performed again (3 k 20) with regard to the (K+1)^(th) codeblock that follows. Meanwhile, if decoding of the K^(th) code blockfails, the terminal stores (3 k 24) the pre-decoding value of thecorresponding code block in the buffer. The terminal then checks whetheror not the K^(th) code block is the last code block (3 k 26). Theabove-described code blocks may all be interpreted as a unitconstituting a transport block of the first service type.

FIG. 3I is a block diagram illustrating the structure of a terminalaccording to embodiments.

Referring to FIG. 3I, the terminal of the disclosure may include aterminal reception unit 3100, a terminal transmission unit 3104, and aterminal processing unit 3102. In an embodiment, the terminal receptionunit 3100 and the terminal transmission unit 3104 may be collectivelyreferred to as a transmission/reception unit. The transmission/receptionunit may transmit/receive a signal to/from a base station. The signalmay include control information and data. To this end, thetransmission/reception unit may include an RF transmitter thatup-converts and amplifies the frequency of a transmitted signal, an RFreceiver that low-noise-amplifies a received signal and down-convertsthe frequency thereof, and the like. In addition, thetransmission/reception unit may receive a signal through a wirelesschannel, output the same to the terminal processing unit 3102, andtransmit a signal output from the terminal processing unit 3102 throughthe wireless channel. The terminal processing unit 3102 may control aseries of processes such that the terminal can operate according to theabove-mentioned embodiment. For example, the terminal reception unit3100 may receive a signal including second signal transmission timinginformation from the base station, and the terminal processing unit 3102may control the same so as to interpret the second signal transmissiontiming. The terminal transmission unit 3104 then may transmit a secondsignal at the second timing.

FIG. 3M is a block diagram illustrating the structure of a base stationaccording to embodiments.

Referring to FIG. 3M, the base station in an embodiment may include atleast one of a base station reception unit 3 m 01, a base stationtransmission unit 3 m 05, and a base station processing unit 3 m 03. Inan embodiment of the disclosure, the base station reception unit 3 m 01and the base station transmission unit 3 m 05 may be collectivelyreferred to as a transmission/reception unit. The transmission/receptionunit may transmit/receive a signal to/from a terminal. The signal mayinclude control information and data. To this end, thetransmission/reception unit may include an RF transmitter thatup-converts and amplifies the frequency of a transmitted signal, an RFreceiver that low-noise-amplifies a received signal and down-convertsthe frequency thereof, and the like. In addition, thetransmission/reception unit may receive a signal through a wirelesschannel, output the same to the base station processing unit 3 m 03, andtransmit a signal output from the terminal processing unit 3 m 03through the wireless channel. The base station processing unit 3 m 03may control a series of processes such that the base station can operateaccording to the above-mentioned embodiment of the disclosure. Forexample, the base station processing unit 3 m 03 may determine secondsignal transmission timing and may perform control so as to generate thesecond signal transmission timing information to be transferred to theterminal. The base station transmission unit 3 m 05 then may transferthe timing information to the terminal, and the base station receptionunit 3 m 01 may receive the second signal at the timing. In addition,according to an embodiment of the disclosure, the base stationprocessing unit 3 m 03 may perform control so as to generate downlinkcontrol information (DCI) including the second signal transmissiontiming information. In this case, the DCI may indicate that the samecorresponds to the second signal transmission timing information.

Meanwhile, the embodiments of the disclosure disclosed in thespecification and the drawings have been presented to easily explaintechnical contents of the disclosure and help comprehension of thedisclosure, and do not limit the scope of the disclosure. That is, it isobvious to those skilled in the art to which the disclosure belongs thatdifferent modifications can be achieved based on the technical spirit ofthe disclosure. Further, if necessary, the above respective embodimentsmay be employed in combination. For example, parts of embodiments of thedisclosure may be combined to operate a base station and a terminal.Further, although the above embodiments have been described on the basisof the NR system, it may be possible to implement other variantembodiments on the basis of the technical idea of the embodiments inother systems such as FDD or TDD LTE systems.

Although exemplary embodiments of the disclosure have been shown anddescribed in this specification and the drawings, they are used ingeneral sense in order to easily explain technical contents of thedisclosure, and to help comprehension of the disclosure, and are notintended to limit the scope of the disclosure. It is obvious to thoseskilled in the art to which the disclosure pertains that other modifiedembodiments on the basis of the spirits of the disclosure besides theembodiments disclosed herein can be carried out.

Meanwhile, the embodiments of the disclosure disclosed in thespecification and the drawings have been presented to easily explaintechnical contents of the disclosure and help comprehension of thedisclosure, and do not limit the scope of the disclosure. That is, it isobvious to those skilled in the art to which the disclosure belongs thatdifferent modifications can be achieved based on the technical spirit ofthe disclosure. Further, if necessary, the above respective embodimentsmay be employed in combination. For example, a base station and aterminal may operate based on the combination of a part of the firstembodiment and a part of the second embodiment of the disclosure.Further, although the above embodiments have been described on the basisof the LTE/LTE-A system, it may be possible to implement other variantembodiments on the basis of the technical idea of the embodiments inother systems such as 5G and NR systems.

1. A method of a terminal in a wireless communication system, the methodcomprising: receiving, from a base station, an indicator indicatingwhether or not a retransmitted code block is to be combined andprocessed; and decoding, based on the indicator, the retransmitted codeblock.
 2. The method as claimed in claim 1, wherein, if the indicatorindicates that the retransmitted code block is to be combined, theretransmitted code block is decoded together with an already-receivedidentical code block.
 3. The method as claimed in claim 1, wherein, ifthe indicator indicates that the retransmitted code block is not to becombined, the retransmitted code block is decoded without considering analready-received identical code block.
 4. The method as claimed in claim1, wherein the information is configured by one bit contained indownlink control information.
 5. A method of a base station in awireless communication system, the method comprising: transmitting, to aterminal, an indicator indicating whether or not a retransmitted codeblock is to be combined and processed; and receiving, from the terminal,a result of decoding the retransmitted code block based on theindicator.
 6. The method as claimed in claim 5, wherein, if theindicator indicates that the retransmitted code block is to be combined,the retransmitted code block is decoded together with analready-received identical code block.
 7. The method as claimed in claim5, wherein, if the indicator indicates that the retransmitted code blockis not to be combined, the retransmitted code block is decoded withoutconsidering an already-received identical code block.
 8. The method asclaimed in claim 5, wherein the information is configured by one bitcontained in downlink control information.
 9. A terminal in a wirelesscommunication system, the terminal comprising: a transmission/receptionunit configured to transmit and receive a signal; and a control unitconfigured to receive, from a base station, an indicator indicatingwhether or not a retransmitted code block is to be combined andprocessed, and configured to decode, based on the indicator, theretransmitted code block.
 10. The terminal as claimed in claim 9,wherein, if the indicator indicates that the retransmitted code block isto be combined, the retransmitted code block is decoded together with analready-received identical code block.
 11. The terminal as claimed inclaim 9, wherein, if the indicator indicates that the retransmitted codeblock is not to be combined, the retransmitted code block is decodedwithout considering an already-received identical code block.
 12. Theterminal as claimed in claim 9, wherein the information is configured byone bit contained in downlink control information.
 13. A base station ina wireless communication system, the base station comprising: atransmission/reception unit configured to transmit and receive a signal;and a control unit configured to transmit, to a terminal, an indicatorindicating whether or not a retransmitted code block is to be combinedand processed, and configured to receive, from the terminal, a result ofdecoding the retransmitted code block based on the indicator.
 14. Thebase station as claimed in claim 13, wherein, if the indicator indicatesthat the retransmitted code block is to be combined, the retransmittedcode block is decoded together with an already-received identical codeblock; and if the indicator indicates that the retransmitted code blockis not to be combined, the retransmitted code block is decoded withoutconsidering an already-received identical code block.
 15. The basestation as claimed in claim 13, wherein the information is configured byone bit contained in downlink control information.